Real head-to-head · same prompt, one shot
Claude Opus 5 vs Grok
The new Anthropic flagship — benched on all 45 one-shot builds the day it landed. vs Snappy + real-time — the X-native model.
Head-to-head verdict: Claude Opus 5 wins 28–15.
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 Opus 5 and Grok, side by side, on 47 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 Opus 5 · Benched on all 45 GoldieBench tasks via API on release day, incremental deploys as scores landed.
Grok · Used for real-time content workflows where the model needs current X timeline context. Standalone bench scoring pending.
Side-by-side on 50 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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Grok
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Where Claude Opus 5 beat Grok
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.
Aurora
Visual
Claude Opus 5 8.6
·
Grok 7.0
(+1.6)
· cinematic aurora scene
What I saw: Gorgeous WebGL curtains with realistic vertical streaks, layered mountains, starfield and water reflection make this a full cinematic scene; polished palette switcher and typography plus reflection depth push it past the field's best.
Aipbpromo
Page
Claude Opus 5 8.3
·
Grok 7.0
(+1.3)
What I saw: Gorgeous cinematic 3D wireframe icosphere backdrop with floating particles, gradient brand title, and full HUD (timeline, progress dots, controls) make this genuinely Remotion-grade; slightly held back by the 'PAUSED' overlay overlapping the brand text in this capture, though the…
Lavalamp
Visual
Claude Opus 5 8.7
·
Grok 7.5
(+1.2)
· metaball lava lamp
What I saw: Gorgeous shader metaball fluid with convincing tapered glass body, glowing gold cap and ribbed metal base, plus palette switching, heat slider and pointer interaction — clearly matches the field's best. Only nit: static screenshot can't confirm morph smoothness, but the blob vari…
Plasma
Visual
Claude Opus 5 8.7
·
Grok 7.5
(+1.2)
· Gorgeous GLSL plasma
What I saw: Stunning WebGL fragment-shader plasma with smooth flowing interference, cosine palettes, visible ripple singularity, 6 palette pills with gradient swatches, blended transitions and a 2D fallback path; polished UI, 65fps, and full brief coverage (palette switcher + click ripples) …
Boids
Sim
Claude Opus 5 8.6
·
Grok 7.5
(+1.1)
· 3D flocking swarm
What I saw: Strong 3D boids sim with a visibly cohesive flock of colorful winged birds, glowing leader, bounding cage, grid floor and full parameter controls (separation/alignment/cohesion/vision/hawk) running at 66fps. Polished UI and clear emergent clustering put it at the top of the field…
Where Grok beat Claude Opus 5
The tasks where I gave Grok a higher 0–10 score on the same prompt — with the actual commentary from my source guides.
Twilightvale
Game
Grok 9.5
·
Claude Opus 5 7.3
(+2.2)
· winner · open world depth
What I saw: Twilight Vale — 3D open-world RPG with hand-crafted village, NPCs, combat, day/night, weather, inventory. 38KB — densest build of the bench, edges out Fusion's 32KB.
Pool
Game
Grok 8.0
·
Claude Opus 5 6.0
(+2.0)
What I saw: Canvas2D billiards with 16 balls, pockets, click-drag aim + power. 16KB.
Doom
Game
Grok 8.5
·
Claude Opus 5 6.8
(+1.7)
What I saw: Doom-style FPS with sprite enemies, gun + muzzle flash + ammo/health HUD, textures, pointer-lock mouse-look. 22KB.
Neonblaster
Game
Grok 8.5
·
Claude Opus 5 6.8
(+1.7)
What I saw: Juicy 2D arcade space shooter — waves, bosses, power-ups, screen-shake, synth music via Web Audio, neon particles. 24KB.
Arcade
Game
Grok 8.0
·
Claude Opus 5 6.5
(+1.5)
What I saw: A crisp neon Asteroids — glowing ship, lives, score, drifting rocks, real sound. Shippable straight out of one prompt.
Strengths & weaknesses I logged
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
Grok
Strengths
- Real-time access to X timeline data — unique signal no other model has
- Snappy latency on shorter prompts
- 256K context window keeps pace with the open-weights field
Trade-offs
- 13 demos on the bench but zero have curated 0–10 verdicts yet — currently unranked
- API access is gated behind X Premium, awkward for backend agent loops
Pricing & context — the spec sheet
| Spec | Claude Opus 5 | Grok |
|---|---|---|
| Vendor | Anthropic | xAI |
| Context window | 1,000,000 tokens | 256,000 tokens |
| Price | $5 / $25 per M | Subscription via X Premium |
| Pricing detail | 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. | Bundled with X (Twitter) Premium subscription — no per-token bill for end users, no individual API pricing for the chat product. |
| Release | 2026-07 | 2026-04 |
| Bench coverage | 50/50 scored · avg 8.27/10 | 43/47 scored · avg 8.09/10 |
The verdict — which should you pick?
Across 43 scored shared tasks, the averages are essentially tied — Claude Opus 5 8.29 vs Grok 8.09. This isn't the comparison where one wins; it's the comparison where you pick based on context, pricing, and what you're actually trying to ship.
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 Opus 5 and Grok both into the Agent Operating System and dispatch each from the kanban by task type — hardest agentic builds → Claude Opus 5, workflows that need live x / twitter context → Grok. That's the same setup I run for the 4,000+ founders inside the AI Profit Boardroom.
FAQ — Claude Opus 5 vs Grok
Which is better, Claude Opus 5 or Grok?
On Goldie Bench, Claude Opus 5 averages 8.29/10 across the shared tasks, with 13 gold, 7 silver, 5 bronze overall. Grok averages 8.09/10, with 5 gold, 1 silver, 1 bronze. Claude Opus 5 wins the head-to-head 28–15.
How much does Claude Opus 5 cost vs Grok?
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. Grok: Bundled with X (Twitter) Premium subscription — no per-token bill for end users, no individual API pricing for the chat product.
What's the context window for Claude Opus 5 vs Grok?
Claude Opus 5 has a 1,000,000 tokens context window. Grok has a 256,000 tokens context window.
When should I pick Claude Opus 5 over Grok?
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.
When should I pick Grok over Claude Opus 5?
Pick Grok for: Workflows that need live X / Twitter context; Snappy prompts where latency matters; Researchers comparing X-native models against the rest of the field. The trade-off is the weaknesses we logged on the bench: 13 demos on the bench but zero have curated 0–10 verdicts yet — currently unranked; API access is gated behind X Premium, awkward for backend agent loops.
How does Goldie Bench score Claude Opus 5 vs Grok?
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 Opus 5 vs Fusion Grok vs Fusion Claude Opus 5 vs Hermes MoA Grok vs Hermes MoA Claude Opus 5 vs GPT-5.6 Sol Grok vs GPT-5.6 Sol Claude Opus 5 vs Claude Fable 5 Grok vs Claude Fable 5Full model pages: Claude Opus 5 · Grok · 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