Real head-to-head · same prompt, one shot
Claude Sonnet 5 vs Claude Opus 5
The agentic SWE frontier — 82% SWE-bench Verified, Dev Team mode. vs The new Anthropic flagship — benched on all 45 one-shot builds the day it landed.
Head-to-head verdict: Claude Sonnet 5 wins 9–4.
What I tested — same prompt, two models
I run the same fixed prompt set through every new model the day it drops — same string, one shot, single HTML file out — and I score the result 0–10 on whether it ran, how close it hit the brief, and how good it looked. Below is what came out when I gave the exact same prompts to Claude Sonnet 5 and Claude Opus 5, side by side, on 22 shared tasks inside the Agent Operating System.
Both models were given identical prompts inside the Agent Operating System — no help, no iteration, no "best of N" tricks. I run each prompt once, save the HTML file the model produces, and score it 0–10 on whether it ran, how close it hit the brief, and how good it looked. The scoring is mine. The verdicts below are pulled from my source comparison guides at agentos.guide where I publish every score and the reasoning behind it.
Claude Sonnet 5 · Reach for it in Agent OS when the job is iterative, tool-using software engineering. For one-shot visual builds, GLM 5.2 (free) beat it 4-1 here.
Claude Opus 5 · Benched on all 45 GoldieBench tasks via API on release day, incremental deploys as scores landed.
Side-by-side on 47 shared tasks
Click any cell to play that model's actual one-shot attempt. Medals are derived from my 0–10 scores per task (highest = 🥇, second = 🥈, third = 🥉).
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Claude Sonnet 5
Claude Opus 5
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Where Claude Sonnet 5 beat Claude Opus 5
The tasks where I gave Claude Sonnet 5 a higher 0–10 score on the same prompt — with the actual commentary from my source guides.
Neonracer
Game
Claude Sonnet 5 8.4
·
Claude Opus 5 2.0
(+6.4)
· neon vapor trails
What I saw: Strong synthwave aesthetic with clean cyan/magenta neon edges, glowing grid floor, and vivid dual-color vapor trails behind the car — the particle effects are the standout. Slightly generic car model and empty upper sky hold it just below the top mark.
Game
Game
Claude Sonnet 5 8.2
·
Claude Opus 5 2.5
(+5.7)
What I saw: Strong, polished 3D Three.js build with clean neon aesthetic, glowing player orb, colorful octahedron collectibles, spinning obstacles, shadows, starfield, and full HUD/lives/timer loop — clearly shippable. Falls just short of the field's best due to being a fairly familiar colle…
Crypt
Game
Claude Sonnet 5 6.5
·
Claude Opus 5 2.0
(+4.5)
What I saw: Renders with atmospheric HUD, functional minimap showing the maze, and a working torch-lit dungeon architecture in code, but the screenshot is too dark/muddy with no visible walls, torches, or dungeon geometry — the dim ambient/fog balance undersells the crawler and looks flat ra…
Flightsim
Game
Claude Sonnet 5 5.5
·
Claude Opus 5 3.0
(+2.5)
What I saw: EYEBALL: world renders (terrain/clouds/HUD) but spawns in CRASHED state, plane invisible, TOUCHDOWN banner stuck.
Gtafoot
Game
Claude Sonnet 5 4.5
·
Claude Opus 5 2.5
(+2.0)
What I saw: EYEBALL FAIL: black scene, HUD-only render. Crosshair + minimap + FISTS label on void.
Where Claude Opus 5 beat Claude Sonnet 5
The tasks where I gave Claude Opus 5 a higher 0–10 score on the same prompt — with the actual commentary from my source guides.
Gtadrive
Game
Claude Opus 5 8.4
·
Claude Sonnet 5 4.5
(+3.9)
· polished neon driving
What I saw: Gorgeous cohesive art direction — detailed low-poly car with wheels/shadow, layered cityscape, refined HUD with integrity/velocity/wanted stars and a live minimap showing cop (red) and player markers plus traffic (purple car visible). Pursuit=2 and full control set (fire/steal/bo…
Dogfight
Game
Claude Opus 5 8.4
·
Claude Sonnet 5 6.5
(+1.9)
· polished 3D flight sim
What I saw: Gorgeous detailed player jet, full flight HUD, functional radar showing 4 bogeys, terrain warning, and afterburner/boost systems all read as a shippable 3D dogfighter. Slightly held back because the screenshot shows no visible enemy aircraft in view or active combat/tracers, leav…
Dragonflight
Game
Claude Opus 5 8.2
·
Claude Sonnet 5 7.6
(+0.6)
What I saw: Gorgeous stylized dragon with articulated wings, spine and belly plates plus a polished full HUD (hull/fury/alt/spd/combo, rings, kills, hostiles, distance marker) — clearly shippable and combat-ready with 5 hostiles tracked. Held back from the top by no visible neon rings or ene…
Dragonrealm
Game
Claude Opus 5 8.3
·
Claude Sonnet 5 8.0
(+0.3)
What I saw: Gorgeous atmospheric frozen world — aurora, moon glow, snowy terrain, low-poly pines, ruins, and a well-modeled armored third-person character with sword DRAWN and full HUD (compass, health/stam, kill counter). Strong and clearly shippable, but no visible enemies/dragon or combat…
Strengths & weaknesses I logged
Claude Sonnet 5
Strengths
- 82.1% SWE-bench Verified — first model past 80% on real GitHub-issue repair
- Dev Team multi-agent mode + 1M context for repo-level agentic work
- Precision on hard logic — won the raycaster the open-weight field kept botching
Trade-offs
- One-shot creative-visual builds trail GLM 5.2 here (lost 4 of 5) — no iteration to catch its own bugs
- A temporal-dead-zone bug blanked its N-body orbit sim on the first shot
Claude Opus 5
Strengths
- Frontier-class coding + agentic reasoning (Claude 5 family)
- 1M-token context — reads an entire codebase in one call
- Benched here with skill-infused game prompts the day of release
Trade-offs
- Premium pricing ($5/$25 per M) — route the everyday 90% to cheaper lanes
- Reasoning-by-default eats token budgets unless tuned per call
Pricing & context — the spec sheet
| Spec | Claude Sonnet 5 | Claude Opus 5 |
|---|---|---|
| Vendor | Anthropic | Anthropic |
| Context window | 1,000,000 tokens | 1,000,000 tokens |
| Price | $3 / $15 per M ($2/$10 intro) | $5 / $25 per M |
| Pricing detail | $3.00 input / $15.00 output per million tokens; introductory $2.00/$10.00 through 2026-08-31. | Anthropic's brand-new flagship — the first Opus of the Claude 5 family, with a 1M-token context window. Benched via API the day it dropped; game tasks use our skill-infused AAA build prompts. |
| Release | 2026-06-30 | 2026-07 |
| Bench coverage | 47/47 scored · avg 7.01/10 | 13/22 scored · avg 5.60/10 |
The verdict — which should you pick?
Across 13 scored shared tasks, Claude Sonnet 5 averaged 7.11/10, beating Claude Opus 5's 5.60/10 by 1.51 points. Pick Claude Sonnet 5 when the build has to ship on the first prompt and you can afford the trade-offs in the comparison below.
If you only run one of these inside your stack, the head-to-head average above is the call. If you can run both, my honest play is to wire Claude Sonnet 5 and Claude Opus 5 both into the Agent Operating System and dispatch each from the kanban by task type — agentic software engineering — write / run / test / fix loops on real repos → Claude Sonnet 5, hardest agentic builds → Claude Opus 5. That's the same setup I run for the 4,000+ founders inside the AI Profit Boardroom.
FAQ — Claude Sonnet 5 vs Claude Opus 5
Which is better, Claude Sonnet 5 or Claude Opus 5?
On Goldie Bench, Claude Sonnet 5 averages 7.11/10 across the shared tasks, with 0 gold, 2 silver, 2 bronze overall. Claude Opus 5 averages 5.60/10, with 0 gold, 0 silver, 1 bronze. Claude Sonnet 5 wins the head-to-head 9–4.
How much does Claude Sonnet 5 cost vs Claude Opus 5?
Claude Sonnet 5: $3.00 input / $15.00 output per million tokens; introductory $2.00/$10.00 through 2026-08-31. Claude Opus 5: Anthropic's brand-new flagship — the first Opus of the Claude 5 family, with a 1M-token context window. Benched via API the day it dropped; game tasks use our skill-infused AAA build prompts.
What's the context window for Claude Sonnet 5 vs Claude Opus 5?
Claude Sonnet 5 has a 1,000,000 tokens context window. Claude Opus 5 has a 1,000,000 tokens context window.
When should I pick Claude Sonnet 5 over Claude Opus 5?
Pick Claude Sonnet 5 for: Agentic software engineering — write / run / test / fix loops on real repos; Repo-level reasoning across a 1M-token context (Dev Team multi-agent mode); Precise logic — raycasters, physics — where one-shot open models slip. The trade-off is the weaknesses we logged on the bench: One-shot creative-visual builds trail GLM 5.2 here (lost 4 of 5) — no iteration to catch its own bugs; A temporal-dead-zone bug blanked its N-body orbit sim on the first shot.
When should I pick Claude Opus 5 over Claude Sonnet 5?
Pick Claude Opus 5 for: Hardest agentic builds; Whole-repo reasoning; Frontier one-shots. The trade-off is the weaknesses we logged on the bench: Premium pricing ($5/$25 per M) — route the everyday 90% to cheaper lanes; Reasoning-by-default eats token budgets unless tuned per call.
How does Goldie Bench score Claude Sonnet 5 vs Claude Opus 5?
Every demo on this page was built by Julian Goldie inside the Agent Operating System — same fixed prompt for both models, one shot, single HTML file out. Each result gets a 0–10 score on whether it ran, how close it hit the brief, and how good it looked. The highest score on each task gets gold; second gets silver; third gets bronze. See methodology for full provenance.
Related comparisons
Other head-to-heads using the same scoring system:
Claude Sonnet 5 vs Fusion Claude Opus 5 vs Fusion Claude Sonnet 5 vs Hermes MoA Claude Opus 5 vs Hermes MoA Claude Sonnet 5 vs GPT-5.6 Sol Claude Opus 5 vs GPT-5.6 Sol Claude Sonnet 5 vs Claude Fable 5 Claude Opus 5 vs Claude Fable 5Full model pages: Claude Sonnet 5 · Claude Opus 5 · back to the leaderboard
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