Standard Compute
Model comparison 2026

Claude Opus 5.5 vs Mistral Large 4

Claude Opus 5.5
Anthropic · Frontier · Proprietary
$8.80/1M · 1M ctx
Mistral Large 4
Mistral · Balanced · Open weights
$1.10/1M · 1.0M 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 4
Maker
Anthropic
Mistral
Blended price / 1M
$8.80
$1.10
Input / output
$4.00 in · $20 out / 1M tokens
$0.68 in · $2.09 out / 1M tokens
Context window
1M
1.0M
Open weights
No
Yes
Tool use
Yes
Yes
Reasoning
Yes
Yes
Output Quality
10.0
7.6
Agentic Ability
10.0
7.1
Speed
7.6
7.0
Value for money
5.7
5.9
Reliability
9.5
8.8

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

Verdict: Opus 5.5 or Mistral Large 4?

Updated 2026-10-13

Choose Claude Opus 5.5 if you want the hardest coding and agent steps, with Sonnet 5.5 handling routine work. Choose Mistral Large 4 if you want open-weight, EU-provenance agent work that needs long context and image input.

In our editorial scoring, Claude Opus 5.5 leads in 4 of five dimensions (output quality, agentic ability, speed and reliability), while Mistral Large 4 leads in 1. On price, Claude Opus 5.5 runs about $8.80 per 1M tokens (blended) and is proprietary; Mistral Large 4 is about $1.10 and open-weight.

Where Opus 5.5 falls short
  • Costs twice Sonnet 5.5 per request ($0.107 vs $0.053) for a small measured gain
  • Sonnet 5.5 scores higher in Artificial Analysis's Terminal-Bench 4.0 run (63.6% vs 59.6%)
Full Opus 5.5 breakdown →
Where Mistral Large 4 falls short
  • Still a public preview, so behavior and price can change
  • 26.8% in Artificial Analysis's Terminal-Bench 4.0 run, well below the frontier models
Full Mistral Large 4 breakdown →

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

Every model on this page is included with Standard Compute

Standard Compute

Current frontier models Claude Opus 5.5 · Claude Sonnet 5.5

Your agents never stop.
Your bill never grows.

Frontier models when it counts. Efficient models when it doesn’t. The most intelligence per dollar. One flat bill.

Plans from $19/mo · cancel anytime · 7-day fair refund

7-day fair refund No credit card needed Billing by Stripe1,800+ agent users

Related comparisons