OpenAI
GPT-5.6 Sol
OpenAI's flagship — the Sun of the 5.6 lineup.
Official vendor source
GPT-5.6 Sol is built by OpenAI — see the vendor's own product page, pricing, and docs at openrouter.ai.
Reference benchmarks for GPT-5.6 Sol
These are external benchmarks I pulled from the source comparison guides on agentos.guide — SWE-bench Verified, DRACO, Kilo plan rubric, build-time measurements, vendor-reported coding scores. They are not goldiebench medal scores (those come only from same-prompt one-shot creative coding tasks in the matrix). I surface them here so the spec sheet for GPT-5.6 Sol is honest about what's measured.
What is GPT-5.6 Sol?
GPT-5.6 Sol is the OpenAI frontier model with a 1,050,000 tokens context window, released 2026-07. Tagline: OpenAI's flagship — the Sun of the 5.6 lineup.. Official source: openrouter.ai.
Pricing detail. GPT-5.6 shipped as three models — Luna ($1/$6 per M), Terra ($2.50/$15) and Sol ($5/$30) — each with a same-price pro variant that ships a higher default reasoning effort. All share a ~1.05M-token context window and are rated High capability. Benched here on the flagship, Sol, at medium reasoning effort via OpenRouter.
How I use it inside the Agent OS. Benched on GoldieBench as the flagship Sol at medium reasoning, one-shot, then headless-playtested. In the Agent OS it's the top tier of a routed stack — Sol on the hard calls, Terra for the bulk, Luna for the everyday 90%.
What I built with GPT-5.6 Sol
Every model on Goldie Bench gets the same fixed prompt set — one shot, single HTML file out — and I score the result 0–10 inside the Agent Operating System. Here's what GPT-5.6 Sol shipped on the bench: 50 one-shot demos across 1,050,000 tokens of context. Of those, 50 are scored against the field with my honest 0–10 from the source guides at agentos.guide.
Strengths
- Strong one-shot 3D games — Dragon Realm, Doom raycaster and Skyrim-lite all judged task winners
- Whole 5.6 lineup rated High capability, even the small Luna/Terra tiers — a first for OpenAI
- Huge ~1.05M-token context on every tier, plus a low-to-high reasoning-effort dial
Trade-offs
- Priciest tier on the bench at $30/M output — only worth routing the hardest 10% of work to Sol
- Reasoning can eat the token budget on big open-world briefs (one 0-byte failure until the budget was raised, then it built clean)
Best for
- The hardest reasoning and code where being right beats being cheap
- One-shot game/sim prototypes you want shippable on the first prompt
- The flagship slot in a routed Agent OS — Sol for the hard 10%, Luna/Terra for the rest
Every demo by GPT-5.6 Sol
50 live demos, sorted by category. Click any tile to play the actual one-shot result. Verdicts and 0–10 scores are pulled from the source guides where I posted them publicly.
▶ LIVECrypt
Game
Renders a clean, atmospheric 3D crypt with textured stone walls, pillars, archways, a floating rune and full HUD (torch bar, rune counter, controls) — a solid, shippable first-person crawler. Weakness: lighting reads more purple-lavender than 'torch-lit,' the ambient wash flattens the dungeon mood and undercuts the flickering-flame promise, keeping it just short of the field's best.
▶ LIVEDragonrealm 🥉
Game
Strong on-brief render: cohesive misty low-poly frozen world with layered snow mountains, pines, a ruined watchtower objective, a flying dragon silhouette, drawn sword in view, and elegant Skyrim-style HUD (compass, quest marker, hint bar, health). Very polished atmosphere; only mild weaknesses are the flat mid-ground and somewhat empty snow plain, but it matches/edges the best of the field.
▶ LIVEDoom
Game
Clean raycaster with atmospheric red-lit corridors, a well-drawn menacing demon sprite with glowing eyes and teeth, weapon viewmodel, minimap with hostile dots, and a cohesive DOOM HUD; slightly below the top only for the somewhat cartoonish monster and gradient walls that read more stylized than gritty, but it clearly nails the brief and is shippable.
▶ LIVERacing
Game
Strong, clean third-person 3D racer with a well-modeled player car, receding dashed-line track, guardrails, low-poly trees, an AI car and cones as obstacles, plus a polished HUD (distance/speed/boost). Cohesive lighting and shadows make it shippable, but it reads slightly generic/soft next to the field's best and stops just short of a clear task winner.
▶ LIVESkyrim
Game
Strong on-brief 3D first-person Skyrim-lite: snowy low-poly terrain, distant mountains, pine forest, a stone keep, first-person sword, and a full themed HUD (compass, quest tracker, health/stamina bars). Cohesive and shippable, though the snowy foreground reads a bit washed-out/flat and it stops just short of the field's best.
▶ LIVETwilightvale
Game
Renders cleanly with a cohesive low-poly scene—hooded hero with sword, shrine with pillars/orb, wraith enemies, forest, and a polished HUD with quest/stats/weather. Solid and shippable, but the pastel fog washes out the promised 'twilight' mood and the terrain looks flat/snowy rather than a dramatic vale, keeping it short of the field's best.
▶ LIVEVoxelcraft
Game
Renders a clean, colorful voxel world with trees, water, crosshair, hotbar and day/night HUD — clearly on-brief and polished; strong pointer-lock FPS setup with place/break and fly, though the flat pastel lighting and simple terrain keep it just shy of the top build.
▶ LIVEGtafoot
Game
The screenshot shows a broken top-down camera view (not the intended third-person on-foot perspective) — the world renders as a flat blurry grid with no visible 3D buildings, pedestrians, or player character, only a stray triangle marker; HUD elements (health, weapon, ammo, hint) are present but the core rendered scene fails the brief. Strong HUD/code ambition, but the actual render is essentially non-functional as a GTA on-foot experience.
▶ LIVEGtadrive 🥈
Game
Clean top-down city with well-rendered roads, crosswalks, buildings with lit windows, cars with glowing taillights, an on-foot player with 'E ENTER' prompt, and a full HUD (wanted stars, status panel, minimap, objective, controls) — highly polished and clearly on-brief. Falls just short of task-topping since the screenshot is static free-roam with no cop chase or wanted stars lit, leaving the outrun-cops core visually unproven.
▶ LIVEAipbpromo 🥇
Page
Polished cinematic intro with gorgeous gradient headline, orbit system, floating chips, and a real chapter timeline with play/pause/seek controls that reads distinctly Remotion-like. Slightly generic word-reveal motion and the paused-state overlay obscuring the hero text hold it just below a clear task win.
▶ LIVEParachute 🥈
Game
Strong, clean 3D render with a convincing open chute, rigged skydiver, jungle canopy and a proper HUD showing altitude/fall speed/target and CHUTE OPEN state — polished and clearly on-brief. Slightly held back by the chute filling most of the frame and an empty freefall/plane phase not shown, so it lands solid-shippable but just shy of the field's best.
▶ LIVEFlightsim 🥈
Game
Renders cleanly with a polished, cohesive HUD—airspeed/altitude tapes, compass, throttle, nav map, brackets and flight-path marker—and a believable runway-perspective terrain with a chase-cam aircraft, hitting all brief elements (takeoff, terrain, HUD, landing assist). Loses a touch versus the top field on visual richness (flat terrain, faint aircraft model) but it's strong and shippable.
▶ LIVEArcade 🥇
Game
Gorgeous, fully-rendered neon breakout with rainbow brick grid, glowing paddle/ball, retro perspective grid floor, and clean HUD/controls/pause overlay — strong arcade identity backed by solid physics, DPR scaling, particles and audio. Polish and cohesion put it at the top of the field.
▶ LIVEDogfight 🥈
Game
Beautifully rendered third-person chase-cam scene with a detailed player jet, layered clouds, moon, enemy squadron inbound, and a cohesive HUD (crosshair, armor/boost meters, working radar with blips). Cinematic art direction and complete combat framing make it a clear task winner; only minor risk is depth in actual combat feel.
▶ LIVEDragonflight
Game
Renders a well-modeled segmented dragon with wings, glowing neon rings, cityscape depth and a clean full HUD (score/rings/velocity/combo, fury core meter, message banner, controls) that nails the brief; slightly generic minimalist environment and no visible fire-breath in this frame keep it just under the top-tier winners.
▶ LIVEGame
Game
Strong: the screenshot renders a genuinely polished neon collect-and-evade game with glowing player, orbiting crystals, pulse-radius ring, HUD stats, energy bar, and clean 'Harvest the Light' title — cohesive and shippable. Weak: it's a familiar collector concept, but the execution (combos, pulse mechanic, lives, best-score persistence, mobile controls) elevates it above the field's best.
▶ LIVENeonblaster
Game
Clean render with strong neon HUD, scanline/vignette CRT overlay, glowing ship and polished starfield; source shows waves, bosses with health bars, power-ups, screen-shake, and synth music/SFX. Screenshot is a bit empty (no enemies/action visible) which slightly undersells the juice, keeping it just under the top tier.
▶ LIVENeoncity 🥈
Game
Strong on-brief cyberpunk drive with lit facades in varied neon hues, receding lane markers, street lamps, and a polished HUD/title that sells the midnight-run vibe; only minor weakness is the flat road texture and slightly bare distant horizon, but overall it reads as a genuine city you drive through.
▶ LIVENeonracer 🥇
Game
Strong synthwave scene renders beautifully — retro sun with scanlines, glowing neon arches, layered city skyline, and a clean 3D car with cohesive HUD (nitro, speed, brand). Only nit is the vapor-trail particles aren't visible in this static frame, but the overall polish and on-brief execution clearly top the field.
▶ LIVENordiccrypt
Game
Strong architectural depth with pillars, wooden crossbeams, glowing runes, torches and a distant shrine/portal that reads clearly as an ancient Nordic ruin, plus polished HUD framing. But the lighting is too bright/washed-out for a 'torch-lit dungeon' — it lacks the dark, atmospheric moodiness the best entries nailed, so it's shippable but not the winner.
▶ LIVEOutrun 🥇
Game
Gorgeous, textbook synthwave scene—striped sun, layered mountains, city silhouette, palms, glowing pink-edged road with proper pseudo-3D curve and a neon car—all polished with excellent HUD and title treatment. Only minor nit is the somewhat abstract car sprite, but overall this matches the field's best.
▶ LIVEPool 🥈
Game
Beautifully rendered table with realistic wood rail, felt gradient, numbered balls in a proper triangle rack, and clean HUD; physics/audio and pocketing logic are solid, though the presentation is more of an aesthetically strong standard billiards sim than a genre-redefining winner.
▶ LIVERaycaster
Game
Strong textured raycaster with clean perspective, distinct colored walls, a working live minimap, HUD weapon, shard/level system and full mobile+mouse controls; polished neon aesthetic just shy of topping the field but clearly shippable.
▶ LIVERpg
Game
Strong render: cohesive moonlit forest with layered trees/rocks/flowers, wandering wisp enemies, a clean HUD (HP/mana/XP/gold), quest tracker, minimap, and full control legend — clearly on-brief with combat, inventory, and loot systems in source. Slightly generic character sprite and the static intro message hold it just below the top tier, but it's polished and shippable.
▶ LIVEMatrixrain 🥇
Other
Strong classic matrix rain with authentic katakana glyphs, bright white leaders, tasteful pink accent streams, and clean neon HUD (title, status, hint, live counters) — the subtle grid and glow add polish while interactivity (bend/pulse) elevates it well above the field's best.
▶ LIVEMlx Speedtest 🥇
Other
Strong, cohesive dark dashboard with a beautifully rendered speedometer gauge, sensible MLX-flavored task metadata (Llama 3.2 3B, 4-bit, Metal backend) and clean live-sample layout that clearly beats the generic field. Minor weakness: captured in a paused/pre-run state so metrics read empty (0.0, blank ms/GB/tok/W), leaving the payoff unverified in the shot.
▶ LIVENeonsnake 🥇
Other
Clean, atmospheric render with a well-lit segmented snake, glowing food orb, orbital rings and crisp HUD that clearly beats the field's best on polish; slightly undersold by the muted grid/rings and the neon glow reading softer than the branding promises.
▶ LIVELanding
Page
Strong: cohesive dark cosmic theme, gradient-text headline, and a genuinely convincing dashboard mockup with charts, metrics, floating insight tooltip and glowing orbs that reads as premium SaaS. Weak: standard hero-left/visual-right layout and slight metric label overlap, but overall polish and detail push it above the field's best.
▶ LIVEWebos
Page
Strong, cohesive glassmorphic Web-OS with functional Notes and Terminal windows, a polished dock, desktop icons, topbar and helpful hints — clearly shippable and near the top of the field. Slightly short of the best since Paint isn't shown open and the desktop heading text is partly occluded, but overall a very refined, on-brief build.
▶ LIVEBlackhole 🥉
Sim
Gorgeous shader render — the tilted accretion disk with fine banding, the photon-ring glow above/below the event horizon and the Doppler warm/cool gradient read as genuine gravitational lensing, all wrapped in a clean, polished HUD. Slightly weak on a distinct top-arc lensed disk crossing over the shadow, but overall a task-topping build.
▶ LIVEBoids 🥉
Sim
Beautiful nebula backdrop with colorful trailing boids, clean glass control panel, and full interactive controls (alignment/cohesion/separation/speed, pointer attract/scatter ring) — very polished and clearly on-brief. Slight concern: the FPS readout shows '1 FPS', which if real would indicate performance trouble, keeping it just shy of the top.
▶ LIVECloth 🥉
Sim
Renders cleanly with a convincing draped cloth showing real folds and creases over a polished sphere, gradient fabric coloring and clean UI (gust/reset controls, orbit hint) all shipping-quality. Verlet sim with structural/shear/bend constraints and sphere collision is solid, though the drape looks slightly stiff/faceted and the cloth folds are a touch chaotic rather than settling elegantly, keeping it just shy of the top.
▶ LIVEFluid 🥈
Sim
Gorgeous swirling vortex of multicolored particle trails around a glowing core — the cyan/violet/pink palette, additive-blended trails, and clean UI chrome (title, metrics, custom cursor) make it genuinely polished and clearly on-brief. Not a literal Navier-Stokes fluid sim but the flow-field aesthetic reads as fluid convincingly, and the composition tops the field.
▶ LIVEFractal 🥉
Sim
Crisp WebGL-rendered Mandelbrot with a striking crimson-to-cyan palette, clean glass HUD showing live zoom/coordinates, and full pan/zoom/animate controls plus a canvas fallback; the classic centered set is well-composed and edge detail is sharp, making it a task-topping build. Minor nit: palette is vivid but somewhat conventional and could feel busy at deep zoom.
▶ LIVEGalaxy 🥇
Sim
Gorgeous multi-arm spiral with a convincing bright core glow, tilted perspective, and clean gradient title/hint UI — genuinely photoreal and on-brief. Slightly conservative color palette keeps it from being unmistakably above the field's best, but it clearly matches it.
▶ LIVEOrbit 🥈
Sim
Strong 3D render with glowing sun, ringed body, orbital trails, polar grid, and a clean glassy UI with live stats, energy drift, inspector, and comet/reset controls—clearly on-brief and shippable. Minor caveat: it's a curated N-body-flavored system rather than a chaotic true N-body demo, but the polish and completeness edge it to task-winner level.
▶ LIVEParticleforge 🥈
Sim
Strong: a beautifully rendered 3D particle ring with glowing core, orbital rings, and gradient particle coloring, backed by a clean glassy control panel with attract/repel modes, force slider, and burst — polished and clearly on-brief. Slight weakness is the particles reading as a static torus shell in the still rather than a chaotic swirling well, but the interaction hooks and Three.js physics are all present.
▶ LIVEPathtracer
Sim
Real GLSL path tracer with diffuse/metal/glass materials, area light importance sampling and progressive accumulation is technically legit, and the diffuse pink sphere plus glass sphere read convincingly. But the render is visually broken: the floor is largely black with jagged noisy artifacts, the checker plane and refractive spheres show distracting aliasing/fireflies, and the framing feels off — polished chrome but flawed output keeps it below the shippable bar.
▶ LIVEReactiondiff
Sim
Strong Gray-Scott implementation with clean toroidal Laplacian, presets, feed/kill sliders and a polished glass UI; the screenshot shows the correct mitosis dividing-cell blobs with a nice color palette. It reads slightly early/sparse (few cells, lots of empty space) rather than the dense filled Turing field of the top build, keeping it shippable-strong but just shy of the winner bar.
▶ LIVESolar 🥉
Sim
Strong 3D render with glowing sun, distinct textured planets, asteroid belt, tilted Keplerian orbits, and a polished glass UI with live date/speed and info panel — clearly on-brief and shippable. Minor nit: labels crowd near the inner planets, but overall it beats the field's best.
▶ LIVEWormhole 🥈
Sim
Excellent concentric ring tunnel with convincing depth, glowing core, streak particles and a polished cyan/magenta/gold palette plus a clean neon title and full control set. Minor nit is the slightly sparse outer starfield, but the sense of flying into a real wormhole is genuinely strong and task-winning.
▶ LIVEAurora 🥇
Visual
Gorgeous layered green-to-violet curtains with soft blur, twinkling stars, silhouetted mountains and elegant typography make this genuinely cinematic and on-brief. Interactive wind/tap hints and Kp status polish it; only minor risk is the aurora ribbons overlapping the H1 slightly, but overall it matches the field's best.
▶ LIVEFireworks 🥉
Visual
Gorgeous rendered scene with a gradient night sky, twinkling stars, lit city skyline, multicolored rocket trails and detailed bursts plus polished title/hint UI — clearly a top-tier, on-brief interactive build. Only minor nit: the barrage of simultaneous rocket lines looks slightly busy in the static frame, but the craft and depth are outstanding.
▶ LIVELavalamp
Visual
Renders a polished full 3D lava lamp with glass vessel, metallic base/cap rings, morphing blobs and clean UI overlay — strong and shippable, but the blobs read washed-out/greyish rather than glowing lava colour, undercutting the signature vibrant morph feel.
▶ LIVEMatrix 🥇
Visual
Gorgeous authentic matrix rain with katakana/alphanumeric glyphs, bright white heads fading into green trails, plus tasteful scanlines, vignette, and glowing MATRIX title/HUD. Interactive pointer-bend and pulse/surge features push it above the field's best; only minor nit is the slightly busy overlay, but overall a clear task winner.
▶ LIVEPlasma 🥇
Visual
Strong WebGL cosine-palette plasma renders as a genuinely hypnotic, smooth fluid field with vignette and glow, plus a polished pill palette switcher and clean typography. Interactive ripples, pointer bend, keyboard shortcuts and a fallback path all present — matches the field's best.
▶ LIVESynthwave 🥈
Visual
Nails every synthwave cue — striped sunset, layered neon mountains, twinkling stars, glowing perspective grid with a clean vanishing point and steer/pulse interactivity — with polished typography and gradients; only nit is the paused status showing on capture, otherwise a textbook, task-topping render.
▶ LIVETerrain
Visual
Renders a clean stylized low-poly terrain with trees, biome/relief/sun controls, seed, compass and cruise mode — a solid, polished procedural explorer. But the scene reads flat and washed out with heavy fog obscuring the relief, so it lacks the dramatic elevation and depth of a top build.
▶ LIVEVoxel
Visual
The HUD, water plane, and clouds render cleanly with polished branding, but the entire voxel island terrain is rendered as an unlit black silhouette — likely a lighting/vertexColor/instanceColor failure — which guts the core Minecraft-style landscape brief.
▶ LIVEWaves
Visual
Strong, polished 3D ocean with convincing rolling swells, glowing crests, a charming floating buoy, and clean glassmorphic UI plus orbit/zoom/stir interactivity. Slightly weak spots: the sun renders as a flat dark disc rather than a glowing sun, keeping it just shy of the top of the field.
every demo, in a grid · click any one to play
Compare GPT-5.6 Sol against every other model
Every head-to-head featuring GPT-5.6 Sol. Verdicts shown for scored pairs.
GPT-5.6 Sol
vs
Fusion
Fusion leads 30–17
GPT-5.6 Sol
vs
Hermes MoA
Tied 19–19
GPT-5.6 Sol
vs
Claude Fable 5
GPT-5.6 Sol leads 31–10
GPT-5.6 Sol
vs
Grok
GPT-5.6 Sol leads 28–14
GPT-5.6 Sol
vs
MiniMax M3
GPT-5.6 Sol leads 32–15
GPT-5.6 Sol
vs
Fugu Ultra
GPT-5.6 Sol leads 28–13
GPT-5.6 Sol
vs
GLM-5.2
GPT-5.6 Sol leads 38–9
GPT-5.6 Sol
vs
Fugu Mini
GPT-5.6 Sol leads 29–6
GPT-5.6 Sol
vs
Opus 4.8
GPT-5.6 Sol leads 40–7
GPT-5.6 Sol
vs
Kimi K2.7
GPT-5.6 Sol leads 19–6
GPT-5.6 Sol
vs
Qwable 5 27B Coder
GPT-5.6 Sol leads 36–1
GPT-5.6 Sol
vs
Claude Sonnet 5
GPT-5.6 Sol leads 39–5
GPT-5.6 Sol
vs
Qwen 3.7
GPT-5.6 Sol leads 43–4
GPT-5.6 Sol
vs
Agents-A1
GPT-5.6 Sol leads 44–1
GPT-5.6 Sol
vs
Gemma 4 12B · MLX
GPT-5.6 Sol leads 42–0
GPT-5.6 Sol
vs
Laguna XS 2.1
GPT-5.6 Sol leads 41–1
GPT-5.6 Sol
vs
Qwythos 9B
GPT-5.6 Sol leads 42–0
GPT-5.6 Sol
vs
LongCat-2.0
GPT-5.6 Sol leads 3–1
GPT-5.6 Sol
vs
Hy3
GPT-5.6 Sol leads 6–1
GPT-5.6 Sol
vs
Gemma-4 12B Coder
GPT-5.6 Sol leads 6–0
GPT-5.6 Sol
vs
Kimi K2.7 · Fast
47 shared tasks · unscored
GPT-5.6 Sol
vs
Kimi K2.7 · No-Think
47 shared tasks · unscored
GPT-5.6 Sol
vs
Kimi K2.7 · Quality
47 shared tasks · unscored
GPT-5.6 Sol
vs
Ornith 1.0
42 shared tasks · unscored
GPT-5.6 Sol
vs
Claude Mythos 5
Reference-only
GPT-5.6 Sol
vs
Kilo Code
Reference-only
See all 66 comparisons across every model →
Quick pill index
Direct comparisons against every other scored model on the bench:
GPT-5.6 Sol vs Fusion GPT-5.6 Sol vs Hermes MoA GPT-5.6 Sol vs Claude Fable 5 GPT-5.6 Sol vs Grok GPT-5.6 Sol vs MiniMax M3 GPT-5.6 Sol vs Fugu Ultra GPT-5.6 Sol vs GLM-5.2 GPT-5.6 Sol vs Fugu Mini GPT-5.6 Sol vs Opus 4.8 GPT-5.6 Sol vs Kimi K2.7 GPT-5.6 Sol vs Qwable 5 27B Coder GPT-5.6 Sol vs Claude Sonnet 5 GPT-5.6 Sol vs Qwen 3.7 GPT-5.6 Sol vs Agents-A1 GPT-5.6 Sol vs Gemma 4 12B · MLX GPT-5.6 Sol vs Laguna XS 2.1 GPT-5.6 Sol vs Qwythos 9B GPT-5.6 Sol vs LongCat-2.0 GPT-5.6 Sol vs Hy3 GPT-5.6 Sol vs Gemma-4 12B CoderRead more on agentos.guide: /gpt-5-6-models, /gpt-5-6-prep
GPT-5.6 Sol — frequently asked
What is GPT-5.6 Sol?
GPT-5.6 Sol is OpenAI's AI model — OpenAI's flagship — the Sun of the 5.6 lineup. It has a 1.05M tokens context window and was released 2026-07.
How good is GPT-5.6 Sol at coding and one-shot builds?
On the GoldieBench one-shot build benchmark it averages 8.16/10 across 50 scored tasks, with 11 gold, 11 silver and 7 bronze medals.
How much does GPT-5.6 Sol cost?
$5 / $30 per M. GPT-5.6 shipped as three models — Luna ($1/$6 per M), Terra ($2.50/$15) and Sol ($5/$30) — each with a same-price pro variant that ships a higher default reasoning effort. All share a ~1.05M-token context window and are
Where can I see GPT-5.6 Sol demos?
Every one-shot build is live and playable on this page and on the GoldieBench compare matrix — same prompt as every other model, no retries.
The same stack Julian uses
Run this stack yourself.
Every demo on this bench was built inside the Agent Operating System — one prompt, one shot, single HTML file out. The Agent OS, the prompts, the templates, the weekly walkthroughs and 4,000+ founders shipping with it every day all live inside the AI Profit Boardroom.
4,000+founders
258documented wins
38countries
$59/momonthly