Claude Opus 5 vs Mistral Large 3
Facts only. This page does not pick a winner. For a picked winner, see the use case comparison on Tools.
| Claude Opus 5 | Mistral Large 3 | |
|---|---|---|
| API model IDs | claude-opus-5 | mistral-large-2512 |
| Context window | 1,000,000 | 256,000 |
| Lifecycle | active | active |
| License | proprietary | open-weights |
| Trains on API data | No | Yes |
| Zero data retention | on-request | on-request |
| Input per 1M tokens | $5 (verified 2026-09-08) | $0.5 (verified 2026-09-08) |
Frequently asked questions
- Which has the larger context window, Claude Opus 5 or Mistral Large 3?
- Claude Opus 5 holds 1,000,000 tokens and Mistral Large 3 holds 256,000. Claude Opus 5 holds more. The context window counts the prompt, any attached files, and the reply together.
- Which is cheaper, Claude Opus 5 or Mistral Large 3?
- Per million input tokens, Claude Opus 5 was $5 (verified 2026-09-08) and Mistral Large 3 was $0.5 (verified 2026-09-08). Mistral Large 3 is cheaper per input token. Output tokens cost $25 and $1.5 respectively, and output volume usually decides the bill.
- Does Claude Opus 5 or Mistral Large 3 train on API data?
- Claude Opus 5 does not train on API data by default, and Mistral Large 3 trains on API data by default. Zero data retention is on-request for Claude Opus 5 and on-request for Mistral Large 3. Verified 2026-09-08 and 2026-09-08 against the providers' own documentation.
- Is Claude Opus 5 or Mistral Large 3 being retired?
- Claude Opus 5 is active. Mistral Large 3 is active. Lifecycle checked 2026-09-08 and 2026-09-08. Pin a dated snapshot ID rather than an alias if a retirement would break you.