Model comparison
GPT-5.4 vs Mistral Medium 3.5
GPT-5.4 is the stronger model overall, scoring 59.5 to 39.6 on the Noometry Index. Mistral Medium 3.5 costs 1.9× less per token, which makes it the better buy when GPT-5.4's lead doesn't matter for your workload.
Last verified . 22 shared benchmarks.
Mistral AISummary
- They share 22 benchmarks with published results for both. GPT-5.4 scores higher in 9 categories and Mistral Medium 3.5 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.4 leads 61.7 to 16.6.
- The biggest single-benchmark swing is NYT Connections (extended): 91.3% for GPT-5.4 and 12.9% for Mistral Medium 3.5.
- Mistral Medium 3.5 is cheaper at $1.50 / $7.50 per million input/output tokens, against $2.50 / $15 for GPT-5.4.
- GPT-5.4 accepts more context: 1.05M tokens versus 262K.
- Mistral Medium 3.5 has downloadable open weights; the other is API-only.
Side by side
| GPT-5.4 | Mistral Medium 3.5 | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 59.5 | 39.6 |
| Released | 2026-03-05 | — |
| Weights | Proprietary | Open |
| Context window | 1.05M | 262K |
| Max output | 128K | 210K |
| Input $ / M tokens | $2.50 | $1.50 |
| Output $ / M tokens | $15 | $7.50 |
| Results tracked | 68 | 22 |
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Category by category
Coding GPT-5.4 leads
GPT-5.4: 52.8 (#28), Mistral Medium 3.5: 35.7 (#208)
| Benchmark | GPT-5.4 | Mistral Medium 3.5 |
|---|---|---|
| LMArena WebDev | 1465 | 1263 |
| LMArena Coding | 1497 | 1461 |
| SWE-bench Verified | 76.9% | — |
| DeepSWE | 51.8% | — |
| SciCode | 56.6% | — |
| GSO | 31.4% | — |
| WeirdML | 77.7% | — |
| MirrorCode | 15.6% | — |
| ALE-Bench | 1,607 | — |
| AlgoTune | 1.85 | — |
Agentic & Tool Use Not comparable
GPT-5.4: 46.5 (#12), Mistral Medium 3.5: —
| Benchmark | GPT-5.4 | Mistral Medium 3.5 |
|---|---|---|
| Terminal-Bench | 81.8% | — |
| APEX-Agents | 52.4% | — |
| τ²-bench Banking | 39.4% | — |
| DeepResearch Bench | 35.1% | — |
| PostTrainBench | 19% | — |
| GBAEval | 45.1% | — |
| LMArena Search | 1197 | — |
| METR Time Horizons | 74.3% | — |
| Vending-Bench 2 | 6,144 | — |
Reasoning GPT-5.4 leads
GPT-5.4: 61.7 (#17), Mistral Medium 3.5: 16.6 (#290)
| Benchmark | GPT-5.4 | Mistral Medium 3.5 |
|---|---|---|
| Kagi LLM Benchmark | 63.8% | 41.4% |
| NYT Connections (extended) | 91.3% | 12.9% |
| LMArena Hard Prompts | 1485 | 1436 |
| Epoch Capabilities Index | 156.92 | 141.42 |
| ARC-AGI-2 | 74% | — |
| ARC-AGI-1 | 93.7% | — |
| CritPt | 23.4% | — |
| Chess Puzzles | 44% | — |
| EnigmaEval | 16% | — |
| Thematic Generalization | 80% | — |
| EBR-Bench | 25.4% | — |
| Mystery Game Puzzles | 37% | — |
| DTBench | 94.4% | — |
| LMCA | 52% | — |
| ForecastBench | 59.5 | — |
Math GPT-5.4 leads
GPT-5.4: 73.3 (#14), Mistral Medium 3.5: 36.4 (#113)
| Benchmark | GPT-5.4 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Math | 1488 | 1432 |
| FrontierMath (Tiers 1-3) | 78.6% | — |
| FrontierMath Tier 4 | 49% | — |
| MathArena Final-Answer Competitions | 83.1% | — |
| OTIS Mock AIME 2024-2025 | 97.8% | — |
| ProofBench | 56% | — |
| FrontierMath (Feb 2025 set) | 47.6% | — |
| FrontierMath Tier 4 (v1) | 27.1% | — |
Knowledge GPT-5.4 leads
GPT-5.4: 65.3 (#13), Mistral Medium 3.5: 39.3 (#123)
| Benchmark | GPT-5.4 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Expert | 1507 | 1431 |
| GPQA Diamond | 93.3% | — |
| Humanity's Last Exam | 36.2% | — |
| SimpleQA Verified | 45.1% | — |
| Vectara Hallucination Rate | 7% | — |
Multimodal GPT-5.4 leads
GPT-5.4: 43.8 (#19), Mistral Medium 3.5: 37.6 (#64)
| Benchmark | GPT-5.4 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Vision | 1302 | 1222 |
| Blueprint-Bench 2 | 27.1% | — |
| Furniture Assembly | 37.5% | — |
| LMArena Document | 1471 | — |
Multilingual GPT-5.4 leads
GPT-5.4: 56.4 (#22), Mistral Medium 3.5: 52.1 (#93)
| Benchmark | GPT-5.4 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Non-English | 1465 | 1405 |
| LMArena Chinese | 1520 | 1443 |
| LMArena French | 1493 | 1448 |
| LMArena German | 1472 | 1453 |
| LMArena Korean | 1449 | 1387 |
| LMArena Russian | 1480 | 1396 |
| LMArena Spanish | 1453 | 1406 |
| LMArena Japanese | 1484 | — |
Instruction Following GPT-5.4 leads
GPT-5.4: 77.3 (#25), Mistral Medium 3.5: 74.7 (#87)
| Benchmark | GPT-5.4 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Instruction Following | 1469 | 1414 |
Long Context GPT-5.4 leads
GPT-5.4: 50.3 (#8), Mistral Medium 3.5: 43.2 (#101)
| Benchmark | GPT-5.4 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Longer Query | 1474 | 1414 |
| CL-bench | 27.9% | — |
| CL-bench Life | 21.7% | — |
Writing & Preference GPT-5.4 leads
GPT-5.4: 72.1 (#18), Mistral Medium 3.5: 58.6 (#113)
| Benchmark | GPT-5.4 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Text | 1469 | 1421 |
| LMArena Creative Writing | 1439 | 1372 |
| EQ-Bench 4 | 1272 | 993 |
| LMArena Multi-Turn | 1482 | 1423 |
| EQ-Bench Creative Writing | 1840 | — |
Frequently asked questions
Is GPT-5.4 better than Mistral Medium 3.5?
GPT-5.4 is the stronger model overall, scoring 59.5 to 39.6 on the Noometry Index. Mistral Medium 3.5 costs 1.9× less per token, which makes it the better buy when GPT-5.4's lead doesn't matter for your workload.
Which is cheaper, GPT-5.4 or Mistral Medium 3.5?
Mistral Medium 3.5 is cheaper. It lists at $1.50 per million input tokens and $7.50 per million output tokens; GPT-5.4 lists at $2.50 and $15.
Is GPT-5.4 or Mistral Medium 3.5 better for coding?
GPT-5.4 scores higher on coding benchmarks: 52.8 versus 35.7 in the Noometry coding category.
Which has the bigger context window?
GPT-5.4 does, with 1.05M tokens against 262K.
How many benchmarks do GPT-5.4 and Mistral Medium 3.5 share?
22 benchmarks have published results for both models. GPT-5.4 has 68 scored results on Noometry and Mistral Medium 3.5 has 22.