Real head-to-head · same prompt, one shot
Claude Opus 5 vs MiniMax M3
The new Anthropic flagship — benched on all 45 one-shot builds the day it landed. vs 1M-context frontier model at $0.30/M tokens — cheapest big-context model on the bench.
Head-to-head verdict: Claude Opus 5 wins 30–17.
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 MiniMax M3, 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.
MiniMax M3 · Bench prompts dispatched via OpenRouter. Scored by Claude judge against the same 42 prompts every other model ran.
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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Claude Opus 5
MiniMax M3
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Where Claude Opus 5 beat MiniMax M3
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.
Plasma
Visual
Claude Opus 5 8.7
·
MiniMax M3 6.0
(+2.7)
· 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) …
Blackhole
Sim
Claude Opus 5 9.0
·
MiniMax M3 7.0
(+2.0)
· ray-traced lensing
What I saw: Stunning Schwarzschild ray-traced lensing with a convincing event horizon, warped accretion disk arcing over/under the shadow, Doppler beaming, and a rich lensed starfield — plus a polished, functional control panel with quality/inclination/distance sliders. The only faint quibbl…
Fireworks
Visual
Claude Opus 5 9.0
·
MiniMax M3 7.5
(+1.5)
· harbour firework spectacular
What I saw: Stunning multi-type bursts (rings, peonies, chrysanthemums, willows) over a beautifully lit skyline with reflections, moon, and stars; rich UI with auto/finale/sound controls and live stats make it a clear task winner. Only minor concern is the 22fps under heavy load, but visuall…
Galaxy
Sim
Claude Opus 5 8.8
·
MiniMax M3 7.5
(+1.3)
· Gorgeous spiral vortex
What I saw: Stunning multi-arm spiral with a glowing core, gradient star coloring (gold→pink→blue), halo, and distant starfield — visually the strongest galaxy render, backed by rich swirl/orbit/zoom/supernova interaction. Only nit is FPS at 39, but the composition clearly matches or beats t…
Wormhole
Sim
Claude Opus 5 8.8
·
MiniMax M3 7.5
(+1.3)
· neon warp tunnel
What I saw: Stunning depth with concentric glowing rings receding to a bright core, layered wireframe mesh, colorful motes, and radiating light streaks — genuinely reads as a 3D wormhole flythrough with polished HUD; steering/warp/regenerate controls back it up. Top of the field.
Where MiniMax M3 beat Claude Opus 5
The tasks where I gave MiniMax M3 a higher 0–10 score on the same prompt — with the actual commentary from my source guides.
Neonblaster
Game
MiniMax M3 8.5
·
Claude Opus 5 6.8
(+1.7)
What I saw: 30KB neon space shooter — waves, bosses, power-ups, screen-shake.
Twilightvale
Game
MiniMax M3 9.0
·
Claude Opus 5 7.3
(+1.7)
· winner · biggest open world
What I saw: 47KB — densest open-world. Village, NPCs, combat, day/night, weather, inventory.
Arcade
Game
MiniMax M3 8.0
·
Claude Opus 5 6.5
(+1.5)
What I saw: Neon Breakout — paddle, ball, brick wall, particle trails, score HUD.
Pool
Game
MiniMax M3 7.5
·
Claude Opus 5 6.0
(+1.5)
What I saw: Canvas-2D billiards with 16 balls, pockets, click-drag aim.
Doom
Game
MiniMax M3 8.0
·
Claude Opus 5 6.8
(+1.2)
What I saw: Raycaster + sprite enemies + gun + HUD. 21KB of game logic.
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
MiniMax M3
Strengths
- 1M token context — full repo / full deep-research corpus fits in one call
- $0.30/M input is roughly 1/30th of Opus 4.8 — built for high-volume agent loops
- Solid one-shot HTML output — clean structure on game and visual prompts
Trade-offs
- Less polished than Fusion's panel-ensembled output on the toughest deep builds
- Newer model — less community calibration vs Fable 5 / Opus 4.8
Pricing & context — the spec sheet
| Spec | Claude Opus 5 | MiniMax M3 |
|---|---|---|
| Vendor | Anthropic | MiniMax |
| Context window | 1,000,000 tokens | 1,048,576-token context — matches GLM-5.2 and Fable 5 |
| Price | $5 / $25 per M | $0.30 / 1M input tokens, $1.50 / 1M output |
| 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. | MiniMax M3 is the cheapest 1M-context frontier model on the bench — roughly 1/200th the per-call cost of OpenRouter Fusion and 1/30th of Claude Opus 4.8. Designed for high-volume agent workloads where context length matters but per-call budget is tight. |
| Release | 2026-07 | 2026-06-18 |
| Bench coverage | 50/50 scored · avg 8.27/10 | 47/47 scored · avg 7.97/10 |
The verdict — which should you pick?
Across 47 scored shared tasks, Claude Opus 5 averaged 8.29/10, beating MiniMax M3's 7.97/10 by 0.32 points. Pick Claude Opus 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 Opus 5 and MiniMax M3 both into the Agent Operating System and dispatch each from the kanban by task type — hardest agentic builds → Claude Opus 5, high-volume agent workflows where per-call cost dominates → MiniMax M3. That's the same setup I run for the 4,000+ founders inside the AI Profit Boardroom.
FAQ — Claude Opus 5 vs MiniMax M3
Which is better, Claude Opus 5 or MiniMax M3?
On Goldie Bench, Claude Opus 5 averages 8.29/10 across the shared tasks, with 13 gold, 7 silver, 5 bronze overall. MiniMax M3 averages 7.97/10, with 2 gold, 1 silver, 4 bronze. Claude Opus 5 wins the head-to-head 30–17.
How much does Claude Opus 5 cost vs MiniMax M3?
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. MiniMax M3: MiniMax M3 is the cheapest 1M-context frontier model on the bench — roughly 1/200th the per-call cost of OpenRouter Fusion and 1/30th of Claude Opus 4.8. Designed for high-volume agent workloads where context length matters but per-call budget is tight.
What's the context window for Claude Opus 5 vs MiniMax M3?
Claude Opus 5 has a 1,000,000 tokens context window. MiniMax M3 has a 1,048,576-token context — matches GLM-5.2 and Fable 5 context window.
When should I pick Claude Opus 5 over MiniMax M3?
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 MiniMax M3 over Claude Opus 5?
Pick MiniMax M3 for: High-volume agent workflows where per-call cost dominates; 1M-context tasks (whole-repo refactors, deep-research synthesis); Drop-in cheaper alternative to GLM-5.2 with comparable 1M context. The trade-off is the weaknesses we logged on the bench: Less polished than Fusion's panel-ensembled output on the toughest deep builds; Newer model — less community calibration vs Fable 5 / Opus 4.8.
How does Goldie Bench score Claude Opus 5 vs MiniMax M3?
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 MiniMax M3 vs Fusion Claude Opus 5 vs Hermes MoA MiniMax M3 vs Hermes MoA Claude Opus 5 vs GPT-5.6 Sol MiniMax M3 vs GPT-5.6 Sol Claude Opus 5 vs Claude Fable 5 MiniMax M3 vs Claude Fable 5Full model pages: Claude Opus 5 · MiniMax M3 · 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