Model comparison
GPT-5 Mini vs Muse Spark 1.2
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 41.8 on the Noometry Index. GPT-5 Mini costs 2.9× less per token, which makes it the better buy when Muse Spark 1.2's lead doesn't matter for your workload.
Last verified . 24 shared benchmarks.
MetaSummary
- They share 24 benchmarks with published results for both. GPT-5 Mini scores higher in 2 categories and Muse Spark 1.2 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Muse Spark 1.2 leads 51.3 to 23.9.
- The biggest single-benchmark swing is SimpleQA Verified: 21.6% for GPT-5 Mini and 60.3% for Muse Spark 1.2.
- GPT-5 Mini is cheaper at $0.25 / $2 per million input/output tokens, against $1.25 / $4.25 for Muse Spark 1.2.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 400K.
Side by side
| GPT-5 Mini | Muse Spark 1.2 | |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 41.8 | 50.3 |
| Released | 2025-08-07 | 2026-08-05 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 1.05M |
| Max output | 128K | 131K |
| Input $ / M tokens | $0.25 | $1.25 |
| Output $ / M tokens | $2 | $4.25 |
| Results tracked | 60 | 31 |
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Category by category
Coding Muse Spark 1.2 leads
GPT-5 Mini: 40.1 (#146), Muse Spark 1.2: 49.2 (#51)
| Benchmark | GPT-5 Mini | Muse Spark 1.2 |
|---|---|---|
| SciCode | 39.2% | 56.4% |
| WeirdML | 52.7% | 60.3% |
| LMArena Coding | 1406 | 1495 |
| SWE-bench Verified | 64.7% | — |
| DeepSWE | — | 54.9% |
| SWE-bench Verified (bash only) | 59.8% | — |
| LMArena WebDev | — | 1533 |
| SWE-bench Multilingual | 39.7% | — |
| FrontierSWE | — | 12% |
| ALE-Bench | 799.77 | — |
| AlgoTune | 1.38 | — |
Agentic & Tool Use GPT-5 Mini leads
GPT-5 Mini: 31.1 (#70), Muse Spark 1.2: 29.4 (#87)
| Benchmark | GPT-5 Mini | Muse Spark 1.2 |
|---|---|---|
| Terminal-Bench | 34.8% | — |
| APEX-Agents | — | 36.4% |
| Berkeley Function Calling Leaderboard | 55.5% | — |
| GDP.pdf | — | 16% |
| Vending-Bench 2 | -31.18 | — |
Reasoning Muse Spark 1.2 leads
GPT-5 Mini: 23.9 (#168), Muse Spark 1.2: 51.3 (#34)
| Benchmark | GPT-5 Mini | Muse Spark 1.2 |
|---|---|---|
| CritPt | 0% | 17.7% |
| LMArena Hard Prompts | 1380 | 1486 |
| DTBench | 80.5% | 94.7% |
| LMCA | 34.2% | 48.4% |
| Epoch Capabilities Index | 145.52 | 154.87 |
| ARC-AGI-2 | 4.4% | — |
| SimpleBench | — | 74.5% |
| Kagi LLM Benchmark | 70.3% | — |
| NYT Connections (extended) | — | 79.2% |
| ARC-AGI-1 | 54.3% | — |
| Chess Puzzles | 30% | — |
| EnigmaEval | 8.2% | — |
| Mystery Game Puzzles | 10% | — |
| ForecastBench | 61 | — |
Math Too close to call
GPT-5 Mini: 46.7 (#69), Muse Spark 1.2: 46.4 (#70)
| Benchmark | GPT-5 Mini | Muse Spark 1.2 |
|---|---|---|
| ProofBench | 9% | 43% |
| LMArena Math | 1378 | 1471 |
| FrontierMath (Tiers 1-3) | 46.7% | — |
| FrontierMath Tier 4 | 12.2% | — |
| 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 Muse Spark 1.2 leads
GPT-5 Mini: 45.6 (#86), Muse Spark 1.2: 54.1 (#53)
| Benchmark | GPT-5 Mini | Muse Spark 1.2 |
|---|---|---|
| SimpleQA Verified | 21.6% | 60.3% |
| LMArena Expert | 1379 | 1480 |
| GPQA Diamond | 75% | — |
| Humanity's Last Exam | 19.4% | — |
| MMLU-Pro | 83.5% | — |
| Confabulations | 13.3% | — |
| Vectara Hallucination Rate | 12.9% | — |
| GPQA (HELM) | 75.6% | — |
Multimodal Muse Spark 1.2 leads
GPT-5 Mini: 35.6 (#85), Muse Spark 1.2: 43.4 (#25)
| Benchmark | GPT-5 Mini | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | 1202 | 1305 |
| VPCT | 40.2% | — |
Multilingual Muse Spark 1.2 leads
GPT-5 Mini: 48.9 (#137), Muse Spark 1.2: 57.1 (#11)
| Benchmark | GPT-5 Mini | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | 1363 | 1478 |
| LMArena Chinese | 1385 | 1511 |
| LMArena French | 1386 | 1513 |
| LMArena Russian | 1362 | 1487 |
| LMArena Spanish | 1355 | 1498 |
| LMArena German | 1366 | — |
| LMArena Japanese | 1341 | — |
| LMArena Korean | 1308 | — |
Instruction Following Too close to call
GPT-5 Mini: 76.2 (#46), Muse Spark 1.2: 76.7 (#36)
| Benchmark | GPT-5 Mini | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | 1357 | 1461 |
| IFEval | 92.7% | — |
Long Context Muse Spark 1.2 leads
GPT-5 Mini: 41.9 (#132), Muse Spark 1.2: 45.2 (#48)
| Benchmark | GPT-5 Mini | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | 1355 | 1475 |
| Fiction.LiveBench | 69.4% | — |
Writing & Preference Muse Spark 1.2 leads
GPT-5 Mini: 55.2 (#148), Muse Spark 1.2: 72.3 (#14)
| Benchmark | GPT-5 Mini | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | 1373 | 1482 |
| LMArena Creative Writing | 1325 | 1449 |
| EQ-Bench Creative Writing | 1313 | 1840 |
| LMArena Multi-Turn | 1363 | 1494 |
| Short-Story Creative Writing | 83.1% | — |
| WildBench | 85.5% | — |
Frequently asked questions
Is GPT-5 Mini better than Muse Spark 1.2?
Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 41.8 on the Noometry Index. GPT-5 Mini costs 2.9× less per token, which makes it the better buy when Muse Spark 1.2's lead doesn't matter for your workload.
Which is cheaper, GPT-5 Mini or Muse Spark 1.2?
GPT-5 Mini is cheaper. It lists at $0.25 per million input tokens and $2 per million output tokens; Muse Spark 1.2 lists at $1.25 and $4.25.
Is GPT-5 Mini or Muse Spark 1.2 better for coding?
Muse Spark 1.2 scores higher on coding benchmarks: 49.2 versus 40.1 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.2 does, with 1.05M tokens against 400K.
How many benchmarks do GPT-5 Mini and Muse Spark 1.2 share?
24 benchmarks have published results for both models. GPT-5 Mini has 60 scored results on Noometry and Muse Spark 1.2 has 31.