Claude 3.5 Sonnet (upgraded)vsMistral Medium 3.5
Claude 3.5 Sonnet (upgraded) | Mistral Medium 3.5 | |
|---|---|---|
| Specifications | ||
ParametersA rough measure of how big the model is. More parameters usually means more capable and more expensive to run, though it is a poor guide on its own — a smaller, newer model often beats a larger, older one. | — | 128B |
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | — | 256k |
| API pricingUSD per 1M tokens · lower wins | ||
Input priceWhat you pay for everything you send the model — your question, plus any documents or earlier conversation you include with it. | — | $1.50 |
Output priceWhat you pay for the text the model writes back. It is normally the dearer half: producing an answer costs more than reading one. | — | $7.50 |
| Benchmarks | ||
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 49% | 77.6% |
| BenchmarksPublished by one model only | ||
Arena Elo (Code)Community preference (code) — Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | — | 1267 |
| Overview | ||
| Company | Anthropic | Mistral |
| Release date | Oct 22 2024 | Apr 29 2026 |
| Access | Proprietary | Open Weight |
Frequently asked questions
Mistral Medium 3.5 leads Claude 3.5 Sonnet (upgraded) on 1 of the 1 benchmark they both report (SWE-Bench Verified). Only Mistral Medium 3.5 has a verified first-party API price: $1.50 per million input tokens and $7.50 per million output tokens. No pay-as-you-go API rate is tracked for Claude 3.5 Sonnet (upgraded). Claude 3.5 Sonnet (upgraded) shipped 554 days before Mistral Medium 3.5, so benchmark comparisons should account for the intervening progress.
Claude 3.5 Sonnet (upgraded) is proprietary, while Mistral Medium 3.5 is open weight.
On SWE-Bench Verified, Mistral Medium 3.5 leads at 77.6% vs Claude 3.5 Sonnet (upgraded) at 49%.
Claude 3.5 Sonnet (upgraded) was released by Anthropic on Oct 22 2024.
Mistral Medium 3.5 was released by Mistral on Apr 29 2026.
Mistral Medium 3.5 leads on SWE-Bench Verified — Claude 3.5 Sonnet (upgraded) 49% vs Mistral Medium 3.5 77.6%.
Only Mistral Medium 3.5 has a verified first-party API price: $1.50 per million input tokens and $7.50 per million output tokens. No pay-as-you-go API rate is tracked for Claude 3.5 Sonnet (upgraded). Rates are pay-as-you-go API prices verified on August 18, 2026.
Claude 3.5 Sonnet (upgraded) is a proprietary model released by Anthropic. Mistral Medium 3.5 is an open weight model released by Mistral.