# GPT-5.2 Codex vs Muse Spark 1.2

> Muse Spark 1.2 is the stronger model overall, scoring 49.8 to 42.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-2-codex-vs-muse-spark-1-2
- Last updated: 2026-10-10
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5.2 Codex scores higher in 1 category and Muse Spark 1.2 in 1 category; 2 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where GPT-5.2 Codex leads 40.7 to 29.5.
- Muse Spark 1.2 is cheaper at $1.25 / $4.25 per million input/output tokens, against $1.75 / $14 for GPT-5.2 Codex.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 400K.

## Snapshot

| | GPT-5.2 Codex | Muse Spark 1.2 |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 42.2 | 49.8 |
| Rank | 107 | 44 |
| Context | 400K | 1.05M |
| Input $/M | $1.75 | $1.25 |
| Output $/M | $14 | $4.25 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.2 Codex: 45.4 (#66)
- Muse Spark 1.2: 48.6 (#49)

| Benchmark | GPT-5.2 Codex | Muse Spark 1.2 |
|---|---|---|
| LMArena WebDev | 1339 | 1532 |
| DeepSWE | — | 54.9% |
| SWE-bench Verified (bash only) | 72.8% | — |
| SWE-bench Multilingual | 66.3% | — |
| FrontierSWE | — | 12% |
| SciCode | — | 56.4% |
| WeirdML | — | 60.3% |
| LMArena Coding | — | 1497 |
| ALE-Bench | 1,300 | — |

## Agentic & Tool Use

- GPT-5.2 Codex: 40.7 (#20)
- Muse Spark 1.2: 29.5 (#77)

| Benchmark | GPT-5.2 Codex | Muse Spark 1.2 |
|---|---|---|
| Terminal-Bench | 66.5% | — |
| APEX-Agents | — | 36.4% |
| GDP.pdf | — | 16% |

## Reasoning

- GPT-5.2 Codex: —
- Muse Spark 1.2: 50.4 (#32)

| Benchmark | GPT-5.2 Codex | Muse Spark 1.2 |
|---|---|---|
| SimpleBench | — | 74.5% |
| NYT Connections (extended) | — | 79.2% |
| CritPt | — | 17.7% |
| LMArena Hard Prompts | — | 1490 |
| DTBench | — | 94.7% |
| LMCA | — | 48.4% |
| Epoch Capabilities Index | — | 155.18 |

## Math

- GPT-5.2 Codex: —
- Muse Spark 1.2: 43.8 (#68)

| Benchmark | GPT-5.2 Codex | Muse Spark 1.2 |
|---|---|---|
| ProofBench | — | 43% |

## Knowledge

- GPT-5.2 Codex: —
- Muse Spark 1.2: 53.9 (#49)

| Benchmark | GPT-5.2 Codex | Muse Spark 1.2 |
|---|---|---|
| SimpleQA Verified | — | 60.3% |
| LMArena Expert | — | 1485 |

## Multimodal

- GPT-5.2 Codex: —
- Muse Spark 1.2: 42.6 (#24)

| Benchmark | GPT-5.2 Codex | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | — | 1304 |

## Multilingual

- GPT-5.2 Codex: —
- Muse Spark 1.2: 57.4 (#10)

| Benchmark | GPT-5.2 Codex | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | — | 1479 |
| LMArena Chinese | — | 1519 |
| LMArena Russian | — | 1494 |

## Instruction Following

- GPT-5.2 Codex: —
- Muse Spark 1.2: 77.1 (#30)

| Benchmark | GPT-5.2 Codex | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | — | 1466 |

## Long Context

- GPT-5.2 Codex: —
- Muse Spark 1.2: 45.4 (#35)

| Benchmark | GPT-5.2 Codex | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | — | 1483 |

## Writing & Preference

- GPT-5.2 Codex: —
- Muse Spark 1.2: 72.6 (#14)

| Benchmark | GPT-5.2 Codex | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | — | 1486 |
| LMArena Creative Writing | — | 1444 |
| EQ-Bench Creative Writing | — | 1840 |
| LMArena Multi-Turn | — | 1504 |

## FAQ

### Is GPT-5.2 Codex better than Muse Spark 1.2?

Muse Spark 1.2 is the stronger model overall, scoring 49.8 to 42.2 on the Noometry Index.

### Which is cheaper, GPT-5.2 Codex or Muse Spark 1.2?

Muse Spark 1.2 is cheaper. It lists at $1.25 per million input tokens and $4.25 per million output tokens; GPT-5.2 Codex lists at $1.75 and $14.

### Is GPT-5.2 Codex or Muse Spark 1.2 better for coding?

Muse Spark 1.2 scores higher on coding benchmarks: 48.6 versus 45.4 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-5.2 Codex and Muse Spark 1.2 share?

1 benchmark has published results for both models. GPT-5.2 Codex has 5 scored results on Noometry and Muse Spark 1.2 has 28.