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Mistral Large 4 vs Claude Opus 5.5
Claude Opus 5.5 scores higher than Mistral Large 4 on all 4 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Mistral Large 4 is at 25.4 and Claude Opus 5.5 at 100 (out of 100).
Scores as published by each board; table composed October 8, 2026.
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Leaderboard by leaderboard
| Board | Mistral Large 4 | Claude Opus 5.5 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,541.3 | 1,813 | Claude Opus 5.5 |
| LiveBench global average (0-100) | 71.8 | 83.2 | Claude Opus 5.5 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 48 | 67 | Claude Opus 5.5 |
| Artificial Analysis intelligence index · measured runs only | 38.4 | 57.6 | Claude Opus 5.5 |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
For coding
On the ArtificialWatch coding index, Mistral Large 4 is at 44.1 (#20 of 35) and Claude Opus 5.5 at 96.9 (#1). Claude Opus 5.5 scores higher on all 3 coding boards that rate both.
| Coding board | Mistral Large 4 | Claude Opus 5.5 |
|---|---|---|
| LMArena · Coding | 1,492.4 | 1,549.5 |
| LiveBench · Coding | 67.2 | 80.5 |
| Vals Vibe Code Bench | 78.4 | 90.3 |
Mistral Large 4 at a glance
- Developer
- Mistral
- Status
- Live since October 6, 2026
- API price
- $0.68 input / $2.09 output per 1M tokens · Mistral, mistral-large-4
- Context window
- 1.05M tokens
Live — Oct 6, public preview on Mistral's API and OpenRouter · 1T total / 49B active · $0.68 / $2.09 per 1M now (list $1.36 / $4.18) · AA index 38 · open weights promised by end of October.
Mistral Large 4 is out in public preview: 1T parameters, $0.68 in and $2.09 out for now, open weights by the end of October
2026-10-06 · Mistral launched Mistral Large 4 today as a public preview on its own API. Per Mistral's docs it is a natively multimodal mixture-of-experts model with about 1.05 trillion total parameters and 49 billion active, plus a 1.6B vision encoder. Mistral says it will release the open weights by the end of this month.
Claude Opus 5.5 at a glance
- Developer
- Anthropic
- Status
- Live since September 22, 2026
- API price
- $4 input / $20 output per 1M tokens · Anthropic, claude-opus-5-5
- Context window
- 1M tokens
Live — Sep 22 · $4/$20 per MTok, down from Opus 5 at $5/$25 · 1M ctx / 128K out · adaptive thinking always on, default effort medium · cache reads 5% of base input · Anthropic now says start here for most workloads, and Opus 5 is legacy.
Claude Opus 5.5 ships at $4/$20 - and that is LESS than the Opus 5 it replaces
2026-09-22 · Claude Opus 5.5 is live. Our sweep read the id claude-opus-5-5 at 16:24:44 UTC on September 22 and the alert went out at 16:25:45 - 61 seconds later, to 307 inboxes and one phone. The hunt that caught it was armed the previous day, before the model had a confirmed name, on the version range rather than on the rumour.
Markets put the next Claude Opus at 83% by Thursday — the name going around is 5.5
2026-09-21 · Polymarket's "Next Claude Opus released by...?" book, read directly at 06:49 UTC, September 21: 83% by September 24, 91% by September 27, 95% by September 30. Polymarket's own post about nine hours earlier had Thursday at 72%, so the number has been climbing through the day.
Mistral Large 4 vs Claude Opus 5.5: quick answers
Which is better, Mistral Large 4 or Claude Opus 5.5?
It depends on what you measure. Claude Opus 5.5 scores higher than Mistral Large 4 on all 4 public leaderboards that rate both. Claude Opus 5.5's widest lead is on LiveBench. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Mistral Large 4 is at 25.4 and Claude Opus 5.5 at 100 (out of 100).
Which is newer, Mistral Large 4 or Claude Opus 5.5?
Mistral Large 4. It went live on October 6, 2026, 14 days after Claude Opus 5.5 (September 22, 2026).
Which is cheaper, Mistral Large 4 or Claude Opus 5.5?
Mistral Large 4 is cheaper on both input and output. On each vendor's own API, Mistral Large 4 is $0.68 input / $2.09 output per million tokens and Claude Opus 5.5 is $4 input / $20 output per million tokens. Prices as published in the models.dev catalog, as of 2026-10-08.
Which has the bigger context window, Mistral Large 4 or Claude Opus 5.5?
Mistral Large 4, at 1.05M tokens against Claude Opus 5.5's 1M, as each vendor lists it.
How do Mistral Large 4 and Claude Opus 5.5 compare for coding?
On the ArtificialWatch coding index, Mistral Large 4 is at 44.1 (#20 of 35) and Claude Opus 5.5 at 96.9 (#1). Claude Opus 5.5 scores higher on all 3 coding boards that rate both.
Who makes Mistral Large 4 and Claude Opus 5.5?
Mistral Large 4 is from Mistral; Claude Opus 5.5 is from Anthropic.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed October 8, 2026). Boards measure different things, so raw scores are only comparable within a row.
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Also: the bench index · API pricing · the wire