Model comparison
GPT-5.1-Codex-mini vs Muse Spark 1.1
Muse Spark 1.1 has enough public results to be ranked (#51); GPT-5.1-Codex-mini does not yet, so treat this comparison as directional.
Last verified . 1 shared benchmarks.
MetaSummary
- They share 1 benchmark with published results for both. GPT-5.1-Codex-mini scores higher in 1 category and Muse Spark 1.1 in 1 category; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where Muse Spark 1.1 leads 51.3 to 31.6.
- GPT-5.1-Codex-mini is cheaper at $0.25 / $2 per million input/output tokens, against $1.25 / $4.25 for Muse Spark 1.1.
- Muse Spark 1.1 accepts more context: 1.05M tokens versus 400K.
Side by side
| GPT-5.1-Codex-mini | Muse Spark 1.1 | |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 37.3 | 49.9 |
| Released | 2025-11-12 | 2026-04-08 |
| 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 | 2 | 37 |
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Category by category
Coding Muse Spark 1.1 leads
GPT-5.1-Codex-mini: 31.6, Muse Spark 1.1: 51.3 (#40)
| Benchmark | GPT-5.1-Codex-mini | Muse Spark 1.1 |
|---|---|---|
| LMArena WebDev | 1244 | 1542 |
| DeepSWE | — | 53.3% |
| SciCode | — | 58.8% |
| LMArena Coding | — | 1498 |
Agentic & Tool Use GPT-5.1-Codex-mini leads
GPT-5.1-Codex-mini: 38.5, Muse Spark 1.1: 30.8 (#73)
| Benchmark | GPT-5.1-Codex-mini | Muse Spark 1.1 |
|---|---|---|
| Terminal-Bench | 61.6% | — |
| APEX-Agents | — | 31.8% |
| τ²-bench Banking | — | 40.5% |
| GBAEval | — | 7.9% |
| GDP.pdf | — | 15% |
| Vending-Bench 2 | — | 6,520 |
Reasoning Not comparable
GPT-5.1-Codex-mini: —, Muse Spark 1.1: 47.1 (#44)
| Benchmark | GPT-5.1-Codex-mini | Muse Spark 1.1 |
|---|---|---|
| NYT Connections (extended) | — | 84.9% |
| CritPt | — | 15.1% |
| LMArena Hard Prompts | — | 1486 |
| DTBench | — | 94.4% |
| LMCA | — | 49.9% |
| Surface Evolver Bench | — | 52.5% |
| Epoch Capabilities Index | — | 154.21 |
Math Not comparable
GPT-5.1-Codex-mini: —, Muse Spark 1.1: 45.5 (#76)
| Benchmark | GPT-5.1-Codex-mini | Muse Spark 1.1 |
|---|---|---|
| ProofBench | — | 39% |
| LMArena Math | — | 1483 |
Knowledge Not comparable
GPT-5.1-Codex-mini: —, Muse Spark 1.1: 53.1 (#59)
| Benchmark | GPT-5.1-Codex-mini | Muse Spark 1.1 |
|---|---|---|
| SimpleQA Verified | — | 57.8% |
| LMArena Expert | — | 1478 |
Multimodal Not comparable
GPT-5.1-Codex-mini: —, Muse Spark 1.1: 42.6 (#29)
| Benchmark | GPT-5.1-Codex-mini | Muse Spark 1.1 |
|---|---|---|
| LMArena Vision | — | 1293 |
| LMArena Document | — | 1465 |
Multilingual Not comparable
GPT-5.1-Codex-mini: —, Muse Spark 1.1: 56.7 (#17)
| Benchmark | GPT-5.1-Codex-mini | Muse Spark 1.1 |
|---|---|---|
| LMArena Non-English | — | 1472 |
| LMArena Chinese | — | 1518 |
| LMArena French | — | 1494 |
| LMArena German | — | 1466 |
| LMArena Japanese | — | 1451 |
| LMArena Korean | — | 1458 |
| LMArena Russian | — | 1483 |
| LMArena Spanish | — | 1464 |
Instruction Following Not comparable
GPT-5.1-Codex-mini: —, Muse Spark 1.1: 76.5 (#39)
| Benchmark | GPT-5.1-Codex-mini | Muse Spark 1.1 |
|---|---|---|
| LMArena Instruction Following | — | 1457 |
Long Context Not comparable
GPT-5.1-Codex-mini: —, Muse Spark 1.1: 44.8 (#58)
| Benchmark | GPT-5.1-Codex-mini | Muse Spark 1.1 |
|---|---|---|
| LMArena Longer Query | — | 1462 |
Writing & Preference Not comparable
GPT-5.1-Codex-mini: —, Muse Spark 1.1: 73.4 (#11)
| Benchmark | GPT-5.1-Codex-mini | Muse Spark 1.1 |
|---|---|---|
| LMArena Text | — | 1479 |
| LMArena Creative Writing | — | 1437 |
| EQ-Bench Creative Writing | — | 1927 |
| EQ-Bench 4 | — | 1260 |
| LMArena Multi-Turn | — | 1485 |
Frequently asked questions
Is GPT-5.1-Codex-mini better than Muse Spark 1.1?
Muse Spark 1.1 has enough public results to be ranked (#51); GPT-5.1-Codex-mini does not yet, so treat this comparison as directional.
Which is cheaper, GPT-5.1-Codex-mini or Muse Spark 1.1?
GPT-5.1-Codex-mini is cheaper. It lists at $0.25 per million input tokens and $2 per million output tokens; Muse Spark 1.1 lists at $1.25 and $4.25.
Is GPT-5.1-Codex-mini or Muse Spark 1.1 better for coding?
Muse Spark 1.1 scores higher on coding benchmarks: 51.3 versus 31.6 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.1 does, with 1.05M tokens against 400K.
How many benchmarks do GPT-5.1-Codex-mini and Muse Spark 1.1 share?
1 benchmark has published results for both models. GPT-5.1-Codex-mini has 2 scored results on Noometry and Muse Spark 1.1 has 37.