xAI · Grok Build

Grok 4.5

xAI's Grok 4.5 — the coding/agentic model, default in Grok Build. Tops SWE Marathon, ~4x more token-efficient than Opus 4.8, ~80 TPS.

ContextxAI's smartest model, built for coding + agentic tasks; trained alongside Cursor. Default model in Grok Build. Benched here via OpenRouter (x-ai/grok-4.5).
Pricing$2 / 1M input · $6 / 1M output
Tasks tested50
Avg score7.60/10 average
Medals🥇12 🥈34 🥉2
Release2026-07-08
Official sitex.ai/cli (Grok Build) ↗
Official vendor source
Grok 4.5 is built by xAI · Grok Build — see the vendor's own product page, pricing, and docs at x.ai/cli (Grok Build).
Visit x.ai/cli (Grok Build) →

Reference benchmarks for Grok 4.5

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 Grok 4.5 is honest about what's measured.

SWE Marathon (pass@1) — #1
29.0%
Terminal Bench 2.1
83.3%
DeepSWE 1.0 (pass@1)
62.0%
SWE-Bench Pro
64.7%
Token efficiency vs Opus 4.8
4.2x fewer

What is Grok 4.5?

Grok 4.5 is the xAI · Grok Build frontier model with a xAI's smartest model, built for coding + agentic tasks; trained alongside Cursor. Default model in Grok Build. Benched here via OpenRouter (x-ai/grok-4.5). context window, released 2026-07-08. Tagline: xAI's Grok 4.5 — the coding/agentic model, default in Grok Build. Tops SWE Marathon, ~4x more token-efficient than Opus 4.8, ~80 TPS.. Official source: x.ai/cli (Grok Build).

Pricing detail. ~4.2x fewer output tokens than Opus 4.8 on SWE-Bench Pro (15,954 vs 67,020 avg) and served at ~80 TPS, so real cost/latency is well below the sticker. Free for a limited time in Grok Build + Cursor.

How I use it inside the Agent OS. Benched one-shot on the same GoldieBench game prompts as the field, with the threejs-game-director patterns baked into each prompt; weak builds iterated by Grok 4.5 itself (the model authors every fix, never hand-patched). Wired into the Agent OS as the newest engine.

What I built with Grok 4.5

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 Grok 4.5 shipped on the bench: 50 one-shot demos across xAI's smartest model, built for coding + agentic tasks; trained alongside Cursor. Default model in Grok Build. Benched here via OpenRouter (x-ai/grok-4.5). of context. Of those, 48 are scored against the field with my honest 0–10 from the source guides at agentos.guide.

Strengths

  • SWE Marathon resolution #1: 29.0% (Opus 4.8 26.0, Fable 24.0)
  • ~4.2x more token-efficient than Opus 4.8 on SWE-Bench Pro (15,954 vs 67,020 avg output tokens); ~80 TPS
  • Strong one-shot game builds: gorgeous multi-part heroes + layered worlds + cohesive HUDs first try (dragonrealm, crypt, skyrim)

Trade-offs

  • Raycaster/FPS (doom) under-renders + walks out of bounds one-shot; needed multiple self-fix passes
  • Occasional TDZ/init bug blanks a build to black (racing) — recovered by the model itself in one pass
  • Not available in the EU until mid-July 2026

Best for

  • One-shot end-to-end app + game builds from a single prompt
  • Cost/latency-sensitive agentic coding loops (token-efficient + fast)
  • Office-work automation (Excel/PowerPoint/Word via Grok Build)

Every demo by Grok 4.5

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.

Crypt▶ LIVE
Crypt 🥈
Game
One-shot: isometric torch-lit dungeon crawler — multi-part knight (helmet, shield, tome), maze walls, wall torch, ghost + slime enemies, minimap, VITA/TORCH/GOLD/KEYS HUD. Lit, cohesive, real models. Strong.
Dragonrealm▶ LIVE
Dragonrealm 🥇
Game
One-shot: Skyrim-style frozen open world that actually walks — multi-part third-person adventurer (hooded head, belt torso, arms, legs, sheathed sword), rolling snow terrain, near/mid/far low-poly pines, mountain silhouettes, health/stamina meters + compass + sword-state chip + dragon counter. Lit, atmospheric, one cohesive HUD. Browser-confirmed walking. Flagship-quality one-shot.
Racing▶ LIVE
Racing 🥈
Game
Model self-fix (one pass): the one-shot blanked to black on a TDZ init bug (elBanner used before declaration) — Grok 4.5 rewrote its own build to fix it, yielding a chase-cam racer with multi-part car, barriered curved track, cones/pickups, SPD/ARM/BST + minimap + LAP HUD. Throttle confirmed (SPD climbs).
Skyrim▶ LIVE
Skyrim 🥈
Game
One-shot: first-person fantasy explorer — multi-part staff viewmodel, forest + ruins world, floating relic, VITALITY/STAMINA + GLORY/Relics/Kills + minimap HUD, cast/interact controls. Lit + atmospheric.
Twilightvale▶ LIVE
Twilightvale 🥈
Game
Model self-fix (one pass): the one-shot black-screened on THREE.CapsuleGeometry (not in r128) — Grok 4.5 rewrote it to compose capsules from cylinder+spheres, yielding a 3D open-world RPG: third-person knight, twilight terrain + ruins + forest, crab enemies, floating relic, HP/ST/XP + RELICS/GOLD + minimap HUD, attack/block/interact.
Voxelcraft▶ LIVE
Voxelcraft 🥈
Game
Model self-fix (one pass): the one-shot had a fatal JS syntax error ('analog') — Grok 4.5 fixed it, yielding a Minecraft-style voxel sandbox: blocky third-person character, green voxel hills + trees, HEALTH/ALTITUDE/DAY-cycle/BLOCKS HUD, 5-slot hotbar + minimap, break/place/jump/survive-the-night.
Gtafoot▶ LIVE
Gtafoot 🥉
Game
One-shot renders + plays but MISSES the brief: instead of a 3D third-person city on foot it produced a flat top-down tactical radar (grid streets, building blocks, a player arrow + green enemy dots). Cohesive and functional, but the wrong genre/view for a showcase 3D GTA — flat 2D, not the intended third-person 3D scene.
Gtadrive▶ LIVE
Gtadrive 🥈
Game
One-shot: GTA-style open-city driver — multi-part car (body, cabin, bed, tail-lights, wheels), city blocks + roads with lane markings, ARMOR/SPEED/WANTED-stars/CARS HUD + RESPECT minimap with dots. Lit, cohesive HUD, real models.
Aipbpromo▶ LIVE
Aipbpromo 🥈
Page
One-shot: clean AIPB promo title-card motion graphics, dark cinematic palette, on-brand type.
Parachute▶ LIVE
Parachute 🥈
Game
skydiver under a deployed parachute descending, altitude/score HUD across freefall→deploy→land phases. Self-fixed from black.
Flightsim▶ LIVE
Flightsim 🥈
Game
One-shot: low-poly plane on runway, framed third-person, altitude/speed HUD.
Arcade▶ LIVE
Arcade 🥈
Game
One-shot: 3D breakout — rainbow brick wall, paddle+ball, HULL/SCORE/BRICKS HUD, lit arena.
Dogfight▶ LIVE
Dogfight 🥈
Game
first-person plane dogfight over low-poly terrain, HP/target HUD. Self-fixed a syntax error.
Dragonflight▶ LIVE
Dragonflight 🥈
Game
One-shot: dragon ring-flight game, RING combo HUD, lit 3D world.
Game▶ LIVE
Game 🥈
Game
One-shot: generic 3D flight-shooter, cohesive HUD + minimap.
Neonblaster▶ LIVE
Neonblaster 🥈
Game
One-shot: top-down neon asteroid shooter, HULL/SCORE HUD, particle hits.
Neoncity▶ LIVE
Neoncity 🥇
Game
One-shot: synthwave neon-city racer — glowing roads, skyline, cohesive HUD.
Neonracer▶ LIVE
Neonracer 🥈
Game
One-shot: neon city racer, boost/steer HUD, lit road + buildings.
Nordiccrypt▶ LIVE
Nordiccrypt 🥈
Game
One-shot: first-person torch-lit crypt with weapon viewmodel + HUD.
Outrun▶ LIVE
Outrun 🥇
Game
One-shot: synthwave outrun driver — sunset, palm-lined road, cohesive HUD; premium retro feel.
Pool▶ LIVE
Pool 🥈
Game
One-shot: 3D pool table — racked balls, cue, pockets, STROKE/POWER HUD.
Raycaster▶ LIVE
Raycaster 🥈
Game
One-shot: Wolfenstein-style raycaster maze + gun viewmodel, 'breach the maze' HUD (the doom genre, done right here).
Rpg▶ LIVE
Rpg 🥈
Game
One-shot: top-down RPG village — character, houses, terrain, cohesive HUD.
Matrixrain▶ LIVE
Matrixrain 🥈
Other
3D neon world with falling code + lit vehicles/props. Self-fixed a syntax error ('invalid token').
Neonsnake▶ LIVE
Neonsnake 🥈
Other
One-shot: 3D snake on a neon grid, SCORE/LENGTH HUD.
Landing▶ LIVE
Landing 🥈
Page
One-shot: clean 'Lumina' SaaS landing page — hero, feature grid, real sections.
Webos▶ LIVE
Webos 🥈
Page
One-shot: 'Aether OS' web desktop — dock, draggable window, menu bar; polished.
Blackhole▶ LIVE
Blackhole 🥇
Sim
One-shot: gorgeous gravitational-lensing accretion disc, mass/spin sliders — premium visual.
Boids▶ LIVE
Boids 🥈
Sim
One-shot: emergent flocking swarm with separation/alignment/cohesion sliders, clean.
Cloth▶ LIVE
Cloth 🥈
Sim
One-shot: real-feel cloth simulation draping over a glossy sphere, physics sliders.
Fluid▶ LIVE
Fluid 🥈
Sim
One-shot: particle fluid/curl-noise field, flow/viscosity sliders, glowing.
Fractal▶ LIVE
Fractal 🥈
Sim
One-shot: interactive Mandelbrot explorer, iteration/zoom controls, vivid palette.
Galaxy▶ LIVE
Galaxy 🥇
Sim
spiral galaxy — glowing purple/blue star disc with core bulge, spin/glow sliders. Self-fixed from an undefined-property crash. Gorgeous.
Orbit▶ LIVE
Orbit 🥈
Sim
n-body orbital ballet — glowing bodies with motion trails, gravity/time sliders. Self-fixed from black.
Particleforge▶ LIVE
Particleforge 🥈
Sim
One-shot: GPU-style particle sculptor with emit/scatter controls.
Pathtracer▶ LIVE
Pathtracer 🥇
Sim
One-shot: progressive path tracer — glossy spheres, soft shadows, accumulating noise on a checker floor; impressive.
Reactiondiff▶ LIVE
Reactiondiff 🥈
Sim
One-shot: Gray-Scott reaction-diffusion Turing patterns, feed/kill sliders.
Solar▶ LIVE
Solar 🥇
Sim
solar system — lit sun, orbiting planets, ringed Saturn, orbit toggles. Self-fixed from a black screen.
Wormhole▶ LIVE
Wormhole 🥇
Sim
wormhole tunnel of concentric glowing rings, warp/intensity sliders. Self-fixed a 'randomDirection is not a function' error. Stunning.
Aurora▶ LIVE
Aurora 🥇
Visual
One-shot: beautiful animated northern-lights over mountains, intensity/flow sliders, atmospheric.
Fireworks▶ LIVE
Fireworks 🥉
Visual
One-shot: celestial fireworks display with controls — works but a touch sparse.
Lavalamp▶ LIVE
Lavalamp 🥈
Visual
One-shot: glowing lava-lamp blobs rising in a glass tube, speed/glow sliders.
Matrix▶ LIVE
Matrix 🥈
Visual
classic green matrix code rain, dense + animated. Self-fixed from black.
Plasma▶ LIVE
Plasma 🥈
Visual
One-shot: animated plasma shader field, palette/speed controls.
Synthwave▶ LIVE
Synthwave 🥇
Visual
One-shot: synthwave sunset grid loop — neon sun, wireframe terrain, glow/pulse sliders; gorgeous.
Terrain▶ LIVE
Terrain 🥈
Visual
One-shot: procedural terrain explorer with elevation/water/day-night sliders.
Voxel▶ LIVE
Voxel 🥇
Visual
One-shot: voxel island landscape with day/night cycle — layered blocks, trees, water; beautiful.
Waves▶ LIVE
Waves 🥇
Visual
ocean wave simulation — glossy teal swell, peaks, atmospheric sky, height/speed sliders. Self-fixed a syntax error.
every demo, in a grid · click any one to play

Compare Grok 4.5 against every other model

Every head-to-head featuring Grok 4.5. Verdicts shown for scored pairs.

Grok 4.5 vs Fusion
Fusion leads 42–2
Grok 4.5 vs Hermes MoA
Hermes MoA leads 36–7
Grok 4.5 vs Claude Fable 5
Claude Fable 5 leads 38–5
Grok 4.5 vs Grok (X real-time)
Grok (X real-time) leads 27–11
Grok 4.5 vs MiniMax M3
MiniMax M3 leads 30–14
Grok 4.5 vs Fugu Ultra
Fugu Ultra leads 28–13
Grok 4.5 vs GLM-5.2
GLM-5.2 leads 26–18
Grok 4.5 vs Fugu Mini
Fugu Mini leads 19–13
Grok 4.5 vs Opus 4.8
Grok 4.5 leads 22–21
Grok 4.5 vs Kimi K2.7
Tied 11–11
Grok 4.5 vs Qwable 5 27B Coder
Grok 4.5 leads 21–17
Grok 4.5 vs Claude Sonnet 5
Claude Sonnet 5 leads 24–20
Grok 4.5 vs Qwen 3.7
Grok 4.5 leads 30–13
Grok 4.5 vs Agents-A1
Grok 4.5 leads 39–4
Grok 4.5 vs Gemma 4 12B · MLX
Grok 4.5 leads 39–2
Grok 4.5 vs Laguna XS 2.1
Grok 4.5 leads 41–0
Grok 4.5 vs Qwythos 9B
Grok 4.5 leads 41–0
Grok 4.5 vs LongCat-2.0
LongCat-2.0 leads 3–1
Grok 4.5 vs Hy3
Grok 4.5 leads 3–1
Grok 4.5 vs Gemma-4 12B Coder
Grok 4.5 leads 6–0
Grok 4.5 vs Kimi K2.7 · Fast
46 shared tasks · unscored
Grok 4.5 vs Kimi K2.7 · No-Think
46 shared tasks · unscored
Grok 4.5 vs Kimi K2.7 · Quality
46 shared tasks · unscored
Grok 4.5 vs Ornith 1.0
41 shared tasks · unscored
Grok 4.5 vs Claude Mythos 5
Reference-only
Grok 4.5 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:

Grok 4.5 vs Fusion Grok 4.5 vs Hermes MoA Grok 4.5 vs Claude Fable 5 Grok 4.5 vs Grok (X real-time) Grok 4.5 vs MiniMax M3 Grok 4.5 vs Fugu Ultra Grok 4.5 vs GLM-5.2 Grok 4.5 vs Fugu Mini Grok 4.5 vs Opus 4.8 Grok 4.5 vs Kimi K2.7 Grok 4.5 vs Qwable 5 27B Coder Grok 4.5 vs Claude Sonnet 5 Grok 4.5 vs Qwen 3.7 Grok 4.5 vs Agents-A1 Grok 4.5 vs Gemma 4 12B · MLX Grok 4.5 vs Laguna XS 2.1 Grok 4.5 vs Qwythos 9B Grok 4.5 vs LongCat-2.0 Grok 4.5 vs Hy3 Grok 4.5 vs Gemma-4 12B Coder

Read more on agentos.guide:

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