Model comparison
GPT-5.5 Instant vs Magistral Small
GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 29.9 on the Noometry Index.
Last verified . 6 shared benchmarks.
Mistral AISummary
- They share 6 benchmarks with published results for both. GPT-5.5 Instant scores higher in 4 categories and Magistral Small in 0 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5.5 Instant leads 48.9 to 30.9.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.1% for GPT-5.5 Instant and 30% for Magistral Small.
- Magistral Small has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Instant | Magistral Small | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 42.5 | 29.9 |
| Released | 2026-05-05 | 2025-06-10 |
| Weights | Proprietary | Open |
| Context window | — | 128K |
| Max output | — | 40K |
| Input $ / M tokens | — | $0.50 |
| Output $ / M tokens | — | $1.50 |
| Results tracked | 27 | 10 |
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Category by category
Coding GPT-5.5 Instant leads
GPT-5.5 Instant: 43.7 (#73), Magistral Small: 37.8 (#172)
| Benchmark | GPT-5.5 Instant | Magistral Small |
|---|---|---|
| SciCode | 48.6% | 35.2% |
| LMArena Coding | 1433 | — |
Reasoning GPT-5.5 Instant leads
GPT-5.5 Instant: 24.2 (#149), Magistral Small: 6.9 (#345)
| Benchmark | GPT-5.5 Instant | Magistral Small |
|---|---|---|
| CritPt | 0% | 0.3% |
| Chess Puzzles | 12% | 3% |
| Epoch Capabilities Index | 142.48 | 133.19 |
| ARC-AGI-2 | — | 0% |
| Kagi LLM Benchmark | — | 6.3% |
| ARC-AGI-1 | — | 5% |
| LMArena Hard Prompts | 1426 | — |
| DTBench | — | 61.3% |
Math GPT-5.5 Instant leads
GPT-5.5 Instant: 26.1 (#241), Magistral Small: 24.9 (#253)
| Benchmark | GPT-5.5 Instant | Magistral Small |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 68.1% | 30% |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| LMArena Math | 1420 | — |
Knowledge GPT-5.5 Instant leads
GPT-5.5 Instant: 48.9 (#68), Magistral Small: 30.9 (#215)
| Benchmark | GPT-5.5 Instant | Magistral Small |
|---|---|---|
| GPQA Diamond | 82.5% | 56.1% |
| LMArena Expert | 1409 | — |
Multimodal Not comparable
GPT-5.5 Instant: 39.3 (#48), Magistral Small: —
| Benchmark | GPT-5.5 Instant | Magistral Small |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |
Multilingual Not comparable
GPT-5.5 Instant: 53.0 (#76), Magistral Small: —
| Benchmark | GPT-5.5 Instant | Magistral Small |
|---|---|---|
| LMArena Non-English | 1417 | — |
| LMArena Chinese | 1457 | — |
| LMArena French | 1428 | — |
| LMArena German | 1410 | — |
| LMArena Japanese | 1408 | — |
| LMArena Korean | 1393 | — |
| LMArena Russian | 1430 | — |
| LMArena Spanish | 1430 | — |
Instruction Following Not comparable
GPT-5.5 Instant: 74.4 (#94), Magistral Small: —
| Benchmark | GPT-5.5 Instant | Magistral Small |
|---|---|---|
| LMArena Instruction Following | 1407 | — |
Long Context Not comparable
GPT-5.5 Instant: 43.4 (#92), Magistral Small: —
| Benchmark | GPT-5.5 Instant | Magistral Small |
|---|---|---|
| LMArena Longer Query | 1422 | — |
Writing & Preference Not comparable
GPT-5.5 Instant: 62.0 (#81), Magistral Small: —
| Benchmark | GPT-5.5 Instant | Magistral Small |
|---|---|---|
| LMArena Text | 1419 | — |
| LMArena Creative Writing | 1420 | — |
| LMArena Multi-Turn | 1434 | — |
Frequently asked questions
Is GPT-5.5 Instant better than Magistral Small?
GPT-5.5 Instant is the stronger model overall, scoring 42.5 to 29.9 on the Noometry Index.
Is GPT-5.5 Instant or Magistral Small better for coding?
GPT-5.5 Instant scores higher on coding benchmarks: 43.7 versus 37.8 in the Noometry coding category.
How many benchmarks do GPT-5.5 Instant and Magistral Small share?
6 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Magistral Small has 10.