Claude Opus 5.5 vs Mistral Small 4

Price, context window & benchmark comparison

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Claude Opus 5.5

Anthropic
$4.00 / $20.00
Input / Output · per 1M tokens
VS
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Mistral Small 4

Mistral AI
$0.15 / $0.60
Input / Output · per 1M tokens
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Verdict: Mistral Small 4 is 30.5× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix. Claude Opus 5.5 scores higher on the Artificial Analysis Intelligence Index (57.6 vs 11.3). Claude Opus 5.5 has the larger context window (1M vs 262K).
Claude Opus 5.5Mistral Small 4
Input price / 1M$4.00$0.15
Output price / 1M$20.00$0.60
Blended price (3:1)$8.00$0.26
Cached input / 1M$0.20$0.015
Context window1M262K
Max output128K210K
Intelligence index57.611.3
Coding index26.6
Providers113
Best provider uptime (30m)100.0%100.0%
Vision inputYesYes
ReasoningYesYes
Tool callingYesYes
Released2026-09-222026-03-16
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FAQ

Which is cheaper, Claude Opus 5.5 or Mistral Small 4?

Mistral Small 4 is 30.5× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix.

Claude Opus 5.5 vs Mistral Small 4: which has a bigger context window?

Claude Opus 5.5: 1,000,000 tokens. Mistral Small 4: 262,144 tokens.

How much would 1 million requests cost?

At 2,000 input + 500 output tokens per request: Claude Opus 5.5 ≈ $18,000, Mistral Small 4 ≈ $600.00.

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