Mistral Large 4 vs Claude Opus 5.5
There is no quality verdict yet: the AIGROW small-business benchmark has not run either model. On price, Mistral Large 4 costs less: $1.36 in and $4.18 out per million tokens, against $4 in and $20 out for Claude Opus 5.5.
Mistral Large 4 is still a preview, so its price can change. US dollars, standard rate, shortest context band. Price only: the benchmark has not run both.
- Mistral Large 4
- $5.75
- Claude Opus 5.5
- $20.00
- Mistral Large 4, per M tokens
- $1.36 / $4.18
- Claude Opus 5.5, per M tokens
- $4 / $20
3,000 tokens in and 400 out each, at list price.
The European flagship against Anthropic's, for buyers who care where their data is processed. 1,000 support replies cost $20.00 on Claude Opus 5.5 and $5.75 on Mistral Large 4, so Claude Opus 5.5 costs 3.5 times as much. Mistral Large 4 was released on 6 Oct 2026, Claude Opus 5.5 was released on 22 Sep 2026.
What each one costs
The API price per million tokens and the cheapest app plan with each model, from the makers’ own pages. Each name opens that model’s full price page.
- Mistral Large 4
- On the Mistral API, Mistral Large 4 costs $1.36 per million input tokens and $4.18 per million output tokens. Vibe has a free plan and paid plans from $14.99/mo (Pro); the plan list does not name Mistral Large 4. Plan prices read 20 October 2026.
- Claude Opus 5.5
- On the Anthropic API, Claude Opus 5.5 costs $4 per million input tokens and $20 per million output tokens. In Claude, the cheapest plan with it is Pro at $20/mo. Plan prices read 20 October 2026. AIGROW API credit runs Claude Opus 5.5 at $1.00 / $5.00 per million input / output tokens, up to 75% below list price. See API credit
Side by side
Each maker’s published rate for its standard tier. Cached input is what a repeated prompt prefix costs once the provider has stored it.
| Fact | Mistral Large 4 | Claude Opus 5.5 |
|---|---|---|
| Maker | Mistral | Anthropic |
| Tier | Flagships | Flagships |
| Input, per M tokens | $1.36 | $4.00 |
| Output, per M tokens | $4.18 | $20.00 |
| Cached input | $0.14 | $0.20 |
| Context window | 1M | 1M |
| Released | 6 Oct 2026 | 22 Sep 2026 |
| Weights | Closed weights | Closed weights |
What a job costs on each
1,000 runs of each job at the two list prices. The gap moves from job to job because the models price input, output and cached context differently.
| Job | Mistral Large 4 | Claude Opus 5.5 | Cheaper |
|---|---|---|---|
| Support reply3,000 in, 400 out. | $5.75 | $20.00 | Mistral Large 4, 71% less |
| Document summary25,000 in, 1,000 out. | $38.18 | $120 | Mistral Large 4, 68% less |
| Agent task80,000 in (70,000 cached), 3,000 out. | $35.94 | $114 | Mistral Large 4, 68% less |
The token counts are ours, chosen to look like real work; the prices are the makers’. A model with no published cache price bills the agent task’s repeated context at its full input rate.
The small print
What each base rate leaves out, from the makers’ own pages: surcharges, discounts, promotions and cache pricing.
- Mistral Large 4
- Mistral Large 4 is in Public Preview. The original price is recorded: Mistral shows a 50% launch discount ($0.68 / $2.09, cached $0.07) for two weeks from 6 October 2026. Mistral calls it open-weight, but the weights were not yet published when read ("Open weights are coming soon"). 1.05T total, 52B active parameters. Batch 50% off. Mistral’s pricing page
- Claude Opus 5.5
- Cache read is 0.05x input on this model ($0.20). Cache write $5 (5 min) or $8 (1 h). Fast mode $8 / $40. Batch API 50% off. US-only inference bills 1.1x. Full context window billed at standard rates. Max output 128K. Anthropic’s pricing page
Other comparisons
Every head to head on the list that involves Mistral Large 4 or Claude Opus 5.5.
Run Claude Opus 5.5 up to 75% below list price
AIGROW API credit covers Claude Opus 5.5 at published rates never above the list prices here, and $25 buys $100 of credit.
Prices checked 15 October 2026