Compare / head-to-head
GPT-5.1vsMistral Medium 3.5
GPT-5.1 leads 1 of 1 shared benchmark. Mistral Medium 3.5 is 1.3x cheaper per token. GPT-5.1 has the larger context window (400K tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
1 – 0
GPT-5.1 leads
Cheaper per token
Mistral Medium 3.5
1.3x cheaper, input + output
Larger context
GPT-5.1
400K tokens
Provider uptime (30d)
94.2446% · 100%
OpenAI · Mistral AI
GPT-5.1
OpenAI · released 2025-11-13
textvision
Mistral Medium 3.5
Mistral AI · released 2026-04-28
textvision
Quality
Benchmark matrix
1 shared · 5 only GPT-5.1 · 2 only Mistral Medium 3.5| Benchmark | GPT-5.1 | Mistral Medium 3.5 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 1 | ||||
| LMArena Elo | 1422.6 ↗ | 1420.6 ↗ | +2 | GPT-5.1 |
| Only GPT-5.1 reports · 5 | ||||
| GPQA Diamond | 87.6% ↗epoch | not reported | — | — |
| AIME 2025 | 94.2% ↗matharena ⚠ | not reported | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 88.6% ↗epoch | not reported | — | — |
| SimpleQA Verified | 48% ↗epoch | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 68% ↗epoch | not reported | — | — |
| Only Mistral Medium 3.5 reports · 2 | ||||
| SWE-bench Verified | not reported | 77.6% ↗ | — | — |
| Tau3 Telecom | not reported | 91.4 ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is GPT-5.1 minus Mistral Medium 3.5 in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | GPT-5.1 | Mistral Medium 3.5 | Edge |
|---|---|---|---|
| Context window | 400K tokens | 256K tokens | GPT-5.1 |
| Max output | 128K tokens | — | — |
| Input price / 1M | $1.25 ↗ | $1.5 ↗ | GPT-5.1 |
| Output price / 1M | $10 ↗ | $7.5 ↗ | Mistral Medium 3.5 |
| Cached input / 1M | $0.125 ↗ | $0.15 ↗ | GPT-5.1 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $11.25 | $9 | Mistral Medium 3.5 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2025-11-13 | 2026-04-28 | — |
| Cited benchmark scores | 6 | 3 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GPT-5.1 vs …
Models sharing the most benchmarksMore matchups
Mistral Medium 3.5 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GPT-5.1 and Mistral Medium 3.5 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.