Model comparison
GPT-5 Mini vs Grok 4.1 Fast
GPT-5 Mini and Grok 4.1 Fast score almost the same on the Noometry Index (41.8 vs 41.4), so choose on price, context window or the category you care about most.
Last verified . 26 shared benchmarks.
Summary
- They share 26 benchmarks with published results for both. GPT-5 Mini scores higher in 4 categories and Grok 4.1 Fast in 6 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 23.9.
- The biggest single-benchmark swing is Berkeley Function Calling Leaderboard: 55.5% for GPT-5 Mini and 69.6% for Grok 4.1 Fast.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.25 / $2 for GPT-5 Mini.
- GPT-5 Mini accepts more context: 400K tokens versus 128K.
Side by side
| GPT-5 Mini | Grok 4.1 Fast | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 41.8 | 41.4 |
| Released | 2025-08-07 | 2025-06-27 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 128K |
| Max output | 128K | 30K |
| Input $ / M tokens | $0.25 | $0.20 |
| Output $ / M tokens | $2 | $0.50 |
| Results tracked | 60 | 32 |
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Category by category
Coding GPT-5 Mini leads
GPT-5 Mini: 40.1 (#146), Grok 4.1 Fast: 34.1 (#245)
| Benchmark | GPT-5 Mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1406 | 1411 |
| ALE-Bench | 799.77 | 394.93 |
| SWE-bench Verified | 64.7% | — |
| SWE-bench Verified (bash only) | 59.8% | — |
| LMArena WebDev | — | 1242 |
| SWE-bench Multilingual | 39.7% | — |
| SciCode | 39.2% | — |
| WeirdML | 52.7% | — |
| AlgoTune | 1.38 | — |
Agentic & Tool Use Grok 4.1 Fast leads
GPT-5 Mini: 31.1 (#70), Grok 4.1 Fast: 36.3 (#39)
| Benchmark | GPT-5 Mini | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | 55.5% | 69.6% |
| Vending-Bench 2 | -31.18 | 1,107 |
| Terminal-Bench | 34.8% | — |
| τ²-bench Banking | — | 13.1% |
| LMArena Search | — | 1171 |
Reasoning Grok 4.1 Fast leads
GPT-5 Mini: 23.9 (#168), Grok 4.1 Fast: 43.4 (#49)
| Benchmark | GPT-5 Mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Hard Prompts | 1380 | 1407 |
| DTBench | 80.5% | 87.7% |
| ForecastBench | 61 | 61 |
| ARC-AGI-2 | 4.4% | — |
| SimpleBench | — | 56% |
| Kagi LLM Benchmark | 70.3% | — |
| NYT Connections (extended) | — | 87.4% |
| ARC-AGI-1 | 54.3% | — |
| CritPt | 0% | — |
| Chess Puzzles | 30% | — |
| EnigmaEval | 8.2% | — |
| Mystery Game Puzzles | 10% | — |
| LMCA | 34.2% | — |
| Epoch Capabilities Index | 145.52 | — |
Math GPT-5 Mini leads
GPT-5 Mini: 46.7 (#69), Grok 4.1 Fast: 31.9 (#221)
| Benchmark | GPT-5 Mini | Grok 4.1 Fast |
|---|---|---|
| ProofBench | 9% | 4% |
| LMArena Math | 1378 | 1408 |
| FrontierMath (Tiers 1-3) | 46.7% | — |
| FrontierMath Tier 4 | 12.2% | — |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 86.7% | — |
| Omni-MATH | 72.2% | — |
| MATH Level 5 | 97.8% | — |
| FrontierMath (Feb 2025 set) | 27.2% | — |
| FrontierMath Tier 4 (v1) | 6.3% | — |
Knowledge GPT-5 Mini leads
GPT-5 Mini: 45.6 (#86), Grok 4.1 Fast: 33.1 (#207)
| Benchmark | GPT-5 Mini | Grok 4.1 Fast |
|---|---|---|
| Vectara Hallucination Rate | 12.9% | 17.8% |
| LMArena Expert | 1379 | 1399 |
| GPQA Diamond | 75% | — |
| Humanity's Last Exam | 19.4% | — |
| SimpleQA Verified | 21.6% | — |
| MMLU-Pro | 83.5% | — |
| Confabulations | 13.3% | — |
| GPQA (HELM) | 75.6% | — |
Multimodal Grok 4.1 Fast leads
GPT-5 Mini: 35.6 (#85), Grok 4.1 Fast: 37.0 (#76)
| Benchmark | GPT-5 Mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1202 | 1201 |
| VPCT | 40.2% | — |
Multilingual Grok 4.1 Fast leads
GPT-5 Mini: 48.9 (#137), Grok 4.1 Fast: 51.0 (#114)
| Benchmark | GPT-5 Mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1363 | 1391 |
| LMArena Chinese | 1385 | 1441 |
| LMArena French | 1386 | 1415 |
| LMArena German | 1366 | 1404 |
| LMArena Japanese | 1341 | 1349 |
| LMArena Korean | 1308 | 1361 |
| LMArena Russian | 1362 | 1387 |
| LMArena Spanish | 1355 | 1413 |
Instruction Following GPT-5 Mini leads
GPT-5 Mini: 76.2 (#46), Grok 4.1 Fast: 72.7 (#133)
| Benchmark | GPT-5 Mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1357 | 1376 |
| IFEval | 92.7% | — |
Long Context Too close to call
GPT-5 Mini: 41.9 (#132), Grok 4.1 Fast: 42.4 (#126)
| Benchmark | GPT-5 Mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1355 | 1390 |
| Fiction.LiveBench | 69.4% | — |
Writing & Preference Grok 4.1 Fast leads
GPT-5 Mini: 55.2 (#148), Grok 4.1 Fast: 57.2 (#131)
| Benchmark | GPT-5 Mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1373 | 1408 |
| LMArena Creative Writing | 1325 | 1394 |
| EQ-Bench Creative Writing | 1313 | 1327 |
| LMArena Multi-Turn | 1363 | 1389 |
| Short-Story Creative Writing | 83.1% | — |
| WildBench | 85.5% | — |
Frequently asked questions
Is GPT-5 Mini better than Grok 4.1 Fast?
GPT-5 Mini and Grok 4.1 Fast score almost the same on the Noometry Index (41.8 vs 41.4), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5 Mini or Grok 4.1 Fast?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; GPT-5 Mini lists at $0.25 and $2.
Is GPT-5 Mini or Grok 4.1 Fast better for coding?
GPT-5 Mini scores higher on coding benchmarks: 40.1 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
GPT-5 Mini does, with 400K tokens against 128K.
How many benchmarks do GPT-5 Mini and Grok 4.1 Fast share?
26 benchmarks have published results for both models. GPT-5 Mini has 60 scored results on Noometry and Grok 4.1 Fast has 32.