Standard Compute
Model comparison 2026

Claude Opus 5.5 vs Mistral Large 3

Claude Opus 5.5
Anthropic · Frontier · Proprietary
$8.80/1M · 1M ctx
Mistral Large 3
Mistral · Balanced · Open weights
$0.80/1M · 262K ctx

Community vote

Pick a winner in each dimension. You can change your vote any time.

Output Quality
Correctness and depth of what it produces
Agentic Ability
Tool calls, instruction-following, and multi-step tasks
Speed
Tokens per second and time-to-first-token
Value for money
How much capability you get per dollar
Reliability
Consistent results: fewer refusals, loops and format breaks

Specs and pricing side by side

Spec
Opus 5.5
Mistral Large 3
Maker
Anthropic
Mistral
Blended price / 1M
$8.80
$0.80
Input / output
$4.00 in · $20 out / 1M tokens
$0.50 in · $1.50 out / 1M tokens
Context window
1M
262K
Open weights
No
Yes
Tool use
Yes
Yes
Reasoning
Yes
No
Output Quality
10.0
8.0
Agentic Ability
10.0
7.8
Speed
7.6
8.0
Value for money
7.4
8.9
Reliability
9.5
8.6

Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).

Verdict: Opus 5.5 or Mistral Large 3?

Updated 2026-10-13

Choose Claude Opus 5.5 if you want the hardest coding and agent work, as the default flagship instead of Fable. Choose Mistral Large 3 if you want general-purpose open-weight agent work, especially in the EU.

In our editorial scoring, Claude Opus 5.5 leads in 3 of five dimensions (output quality, agentic ability and reliability), while Mistral Large 3 leads in 2. On price, Claude Opus 5.5 runs about $8.80 per 1M tokens (blended) and is proprietary; Mistral Large 3 is about $0.80 and open-weight.

Where Opus 5.5 falls short
  • Twice Sonnet 5.5's price per token for a small measured gain
  • Released September 2026, so its long-run track record is still short
Full Opus 5.5 breakdown →
Where Mistral Large 3 falls short
  • Below the very top models
  • Less agent-community momentum than GLM/Qwen
Full Mistral Large 3 breakdown →

The agent matters as much as the model. Compare AI agents →

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Current frontier models Claude Opus 5.5 · Claude Sonnet 5.5

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