Model comparison
GPT-5 Mini vs GPT-6.1 Sol
GPT-6.1 Sol is the stronger model overall, scoring 65.6 to 41.8 on the Noometry Index. GPT-5 Mini costs 5.8× less per token, which makes it the better buy when GPT-6.1 Sol's lead doesn't matter for your workload.
Last verified . 26 shared benchmarks.
Summary
- They share 26 benchmarks with published results for both. GPT-5 Mini scores higher in 0 categories and GPT-6.1 Sol in 10 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-6.1 Sol leads 81.9 to 23.9.
- The biggest single-benchmark swing is ProofBench: 9% for GPT-5 Mini and 99% for GPT-6.1 Sol.
- GPT-5 Mini is cheaper at $0.25 / $2 per million input/output tokens, against $2 / $10 for GPT-6.1 Sol.
- GPT-6.1 Sol accepts more context: 1.05M tokens versus 400K.
Side by side
| GPT-5 Mini | GPT-6.1 Sol | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Noometry Index | 41.8 | 65.6 |
| Released | 2025-08-07 | 2026-09-29 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 1.05M |
| Max output | 128K | 128K |
| Input $ / M tokens | $0.25 | $2 |
| Output $ / M tokens | $2 | $10 |
| Results tracked | 60 | 34 |
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Category by category
Coding GPT-6.1 Sol leads
GPT-5 Mini: 40.1 (#146), GPT-6.1 Sol: 63.2 (#8)
| Benchmark | GPT-5 Mini | GPT-6.1 Sol |
|---|---|---|
| SciCode | 39.2% | 55.8% |
| LMArena Coding | 1406 | 1487 |
| SWE-bench Verified | 64.7% | — |
| DeepSWE | — | 75.2% |
| FrontierCode | — | 50.2% |
| SWE-bench Verified (bash only) | 59.8% | — |
| LMArena WebDev | — | 1755 |
| SWE-bench Multilingual | 39.7% | — |
| WeirdML | 52.7% | — |
| ALE-Bench | 799.77 | — |
| AlgoTune | 1.38 | — |
Agentic & Tool Use GPT-6.1 Sol leads
GPT-5 Mini: 31.1 (#70), GPT-6.1 Sol: 39.6 (#26)
| Benchmark | GPT-5 Mini | GPT-6.1 Sol |
|---|---|---|
| Terminal-Bench | 34.8% | — |
| APEX-Agents | — | 60% |
| Berkeley Function Calling Leaderboard | 55.5% | — |
| GDP.pdf | — | 32% |
| Vending-Bench 2 | -31.18 | — |
Reasoning GPT-6.1 Sol leads
GPT-5 Mini: 23.9 (#168), GPT-6.1 Sol: 81.9 (#2)
| Benchmark | GPT-5 Mini | GPT-6.1 Sol |
|---|---|---|
| ARC-AGI-2 | 4.4% | 94.2% |
| ARC-AGI-1 | 54.3% | 98.5% |
| CritPt | 0% | 31.7% |
| Chess Puzzles | 30% | 61% |
| LMArena Hard Prompts | 1380 | 1466 |
| Mystery Game Puzzles | 10% | 80% |
| Epoch Capabilities Index | 145.52 | 166.09 |
| Kagi LLM Benchmark | 70.3% | — |
| NYT Connections (extended) | — | 95.5% |
| EnigmaEval | 8.2% | — |
| EBR-Bench | — | 54.3% |
| DTBench | 80.5% | — |
| LMCA | 34.2% | — |
| ForecastBench | 61 | — |
Math GPT-6.1 Sol leads
GPT-5 Mini: 46.7 (#69), GPT-6.1 Sol: 93.7 (#1)
| Benchmark | GPT-5 Mini | GPT-6.1 Sol |
|---|---|---|
| FrontierMath (Tiers 1-3) | 46.7% | 93.7% |
| FrontierMath Tier 4 | 12.2% | 100% |
| OTIS Mock AIME 2024-2025 | 86.7% | 100% |
| ProofBench | 9% | 99% |
| LMArena Math | 1378 | 1464 |
| Omni-MATH | 72.2% | — |
| MATH Level 5 | 97.8% | — |
| FrontierMath (Feb 2025 set) | 27.2% | — |
| FrontierMath Tier 4 (v1) | 6.3% | — |
Knowledge GPT-6.1 Sol leads
GPT-5 Mini: 45.6 (#86), GPT-6.1 Sol: 71.8 (#4)
| Benchmark | GPT-5 Mini | GPT-6.1 Sol |
|---|---|---|
| GPQA Diamond | 75% | 95.4% |
| SimpleQA Verified | 21.6% | 73.9% |
| LMArena Expert | 1379 | 1502 |
| Humanity's Last Exam | 19.4% | — |
| MMLU-Pro | 83.5% | — |
| Confabulations | 13.3% | — |
| Vectara Hallucination Rate | 12.9% | — |
| GPQA (HELM) | 75.6% | — |
Multimodal GPT-6.1 Sol leads
GPT-5 Mini: 35.6 (#85), GPT-6.1 Sol: 52.7 (#5)
| Benchmark | GPT-5 Mini | GPT-6.1 Sol |
|---|---|---|
| LMArena Vision | 1202 | 1288 |
| VPCT | 40.2% | — |
| Furniture Assembly | — | 80% |
Multilingual GPT-6.1 Sol leads
GPT-5 Mini: 48.9 (#137), GPT-6.1 Sol: 54.3 (#46)
| Benchmark | GPT-5 Mini | GPT-6.1 Sol |
|---|---|---|
| LMArena Non-English | 1363 | 1438 |
| LMArena Chinese | 1385 | 1477 |
| LMArena Russian | 1362 | 1455 |
| LMArena French | 1386 | — |
| LMArena German | 1366 | — |
| LMArena Japanese | 1341 | — |
| LMArena Korean | 1308 | — |
| LMArena Spanish | 1355 | — |
Instruction Following Too close to call
GPT-5 Mini: 76.2 (#46), GPT-6.1 Sol: 77.0 (#29)
| Benchmark | GPT-5 Mini | GPT-6.1 Sol |
|---|---|---|
| LMArena Instruction Following | 1357 | 1468 |
| IFEval | 92.7% | — |
Long Context GPT-6.1 Sol leads
GPT-5 Mini: 41.9 (#132), GPT-6.1 Sol: 44.9 (#54)
| Benchmark | GPT-5 Mini | GPT-6.1 Sol |
|---|---|---|
| LMArena Longer Query | 1355 | 1465 |
| Fiction.LiveBench | 69.4% | — |
Writing & Preference GPT-6.1 Sol leads
GPT-5 Mini: 55.2 (#148), GPT-6.1 Sol: 63.6 (#63)
| Benchmark | GPT-5 Mini | GPT-6.1 Sol |
|---|---|---|
| LMArena Text | 1373 | 1447 |
| LMArena Creative Writing | 1325 | 1432 |
| LMArena Multi-Turn | 1363 | 1449 |
| Short-Story Creative Writing | 83.1% | — |
| EQ-Bench Creative Writing | 1313 | — |
| WildBench | 85.5% | — |
Frequently asked questions
Is GPT-5 Mini better than GPT-6.1 Sol?
GPT-6.1 Sol is the stronger model overall, scoring 65.6 to 41.8 on the Noometry Index. GPT-5 Mini costs 5.8× less per token, which makes it the better buy when GPT-6.1 Sol's lead doesn't matter for your workload.
Which is cheaper, GPT-5 Mini or GPT-6.1 Sol?
GPT-5 Mini is cheaper. It lists at $0.25 per million input tokens and $2 per million output tokens; GPT-6.1 Sol lists at $2 and $10.
Is GPT-5 Mini or GPT-6.1 Sol better for coding?
GPT-6.1 Sol scores higher on coding benchmarks: 63.2 versus 40.1 in the Noometry coding category.
Which has the bigger context window?
GPT-6.1 Sol does, with 1.05M tokens against 400K.
How many benchmarks do GPT-5 Mini and GPT-6.1 Sol share?
26 benchmarks have published results for both models. GPT-5 Mini has 60 scored results on Noometry and GPT-6.1 Sol has 34.