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Claude Opus 5.5 vs Mistral Small 24B Instruct 2501

Claude Opus 5.5 grades higher overall (99.5 against 20.1). Mistral Small 24B Instruct 2501 costs 99% less for the same work.

Claude Opus 5.5

by Anthropic · #1 of 67 overall

Coming soon · price at launch
Context
1M
Input / 1M
$4.00
Output / 1M
$20.00

Mistral Small 24B Instruct 2501

by Mistral AI · #65 of 67 overall

Coming soon · price at launch
Context
32K
Input / 1M
$0.050
Output / 1M
$0.080

Better overall

Claude Opus 5.5

Grade 99.5 vs 20.1

Cheaper

Mistral Small 24B Instruct 2501

99% less, $0.058 vs $8.00 blended

Larger context

Claude Opus 5.5

1M vs 32K tokens

Head to head

Public benchmarks. Longer is better; each value links to its source.

LMArena TextElo-style rating · LMArena (CC BY 4.0) · Oct 15, 2026
Claude Opus 5.5Claude Opus 5.5: 1,508
Mistral Small 24B Instruct 2501Mistral Small 24B Instruct 2501: 1,274
LMArena WebDevElo-style rating · LMArena (CC BY 4.0) · Oct 13, 2026
Claude Opus 5.5Claude Opus 5.5: 1,811
Mistral Small 24B Instruct 2501Mistral Small 24B Instruct 2501: —
LMArena CodingElo-style rating · LMArena (CC BY 4.0) · Oct 15, 2026
Claude Opus 5.5Claude Opus 5.5: 1,545
Mistral Small 24B Instruct 2501Mistral Small 24B Instruct 2501: 1,312
SWE-Bench Pro% of tasks resolved · Scale AI SWE-Bench Pro · Sep 22, 2026 · reference
Claude Opus 5.5Claude Opus 5.5: 89.9%v
Mistral Small 24B Instruct 2501Mistral Small 24B Instruct 2501: —
Terminal-Bench 4.0% of tasks passed · Terminal-Bench · Sep 22, 2026 · reference
Claude Opus 5.5Claude Opus 5.5: 66.4%v
Mistral Small 24B Instruct 2501Mistral Small 24B Instruct 2501: —

Claude Opus 5.5Mistral Small 24B Instruct 2501v = reported by the model’s maker. — = no public score yet. Arena bars span the range across every model we grade.

What it costs you

Drag to match your monthly usage.

Claude Opus 5.5$1,600 /month
Mistral Small 24B Instruct 2501$13.20 /month

Mistral Small 24B Instruct 2501 saves you $1,587 a month at this usage, $19,042 a year.

At a glance

AttributeClaude Opus 5.5Mistral Small 24B Instruct 2501
Made byAnthropicMistral AI
AvailabilityComing soonComing soon
Overall gradeExcellent · 99.5Good · 20.1
Overall rank#1 of 67#65 of 67
Input price$4.00 per 1M$0.050 per 1M
Output price$20.00 per 1M$0.080 per 1M
Context window1,000,000 tokens32,768 tokens
Reasoning levelsYesNo
Reads imagesYesNo
Model IDclaude-opus-5-5mistral-small-24b-instruct-2501

Try both with one key

Same endpoint, same key, both hosted in the USA. Change one word to switch models, in Claude Code, Cursor, Cline or your own code.

Get your API key
# Ask either model the same thing
curl https://fullsendai.com/v1/chat/completions \
  -H "Authorization: Bearer $FULLSEND_API_KEY" \
  -d '{"model": "claude-opus-5-5", "messages": [...]}'

# …then swap one word
  -d '{"model": "mistral-small-24b-instruct-2501", "messages": [...]}'

Questions

Is Claude Opus 5.5 or Mistral Small 24B Instruct 2501 better?

Claude Opus 5.5 grades 99.5 against 20.1 for Mistral Small 24B Instruct 2501, from public benchmarks.

Which is cheaper, Claude Opus 5.5 or Mistral Small 24B Instruct 2501?

Mistral Small 24B Instruct 2501: $0.050 in and $0.080 out per million tokens, against $4.00 and $20.00 through FullsendAI.

Which has the larger context window?

Claude Opus 5.5, with 1,000,000 tokens.

Can I use both with one API key?

Yes, once they launch: both are coming soon, at the prices shown, and both will use the same FullsendAI key.

Compare with others

Model rankingsAll benchmarksCompare other models

Scores: LMArena (CC BY 4.0), Scale AI SWE-Bench Pro, Terminal-Bench, and model makers’ published results where marked v. Prices are FullsendAI’s, per million tokens. Data as of Oct 28, 2026.