Updated October 15, 2026. Rank says Muse Spark Open is ahead. Price, access, and your workload can each overturn that. Public scores include evidence status and uncertainty.
Both of these models will change. Get the price, version and retirement notices for the pair, each with its source. Follow model changes
Muse Spark Open has the higher public point estimate, 62.66 versus 55.29. Their conditional score ranges overlap. These ranges do not establish rank confidence. 1 results are shared. Category rows resting on Estimated evidence or different benchmark sets are marked directional and do not name a winner.
Recommendations appear only when a shared evidence basis or an explicit operating constraint supports the call. Secondary and unsupported use cases stay disclosed below the initial list.
Code generation, repair, and software-engineering tasks
Muse Spark Open
Muse Spark Open has the higher public coding point estimate, 56.1 to 43.6, with Supported evidence for both models. The conditional ranges do not establish rank confidence.
Prompts that approach the documented context limit
Muse Spark Open
Muse Spark Open has the larger documented context window.
Tool use, computer use, and multi-step task completion
Not enough matched evidence
GPT-5.2-Codex and Muse Spark Open are scored on Estimated evidence for agentic, so the reading is directional rather than like-for-like.
1K fresh input + 500 output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
200K cached + 20K fresh input + 10K output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
50K fresh input + 3K output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
Choose a job from the LLM Selector's task catalog to see the category row it rests on, under the same basis rules as the table below. A directional row stays directional; choosing a job never creates a winner.
The same task catalog as the LLM Selector. Each job names the evidence surface it rests on; nothing here adds a new score.
Like-for-like · BenchAlign v5.8
Muse Spark Open has the higher coding point estimate. Conditional score ranges do not establish rank confidence.
Coding scores combine specific tasks and setups. Match the editor, harness, and effort to your workflow.
Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.
2 categories rest on Estimated evidence or different evidence sets. Those rows remain visible for coverage context but do not name a winner.
Only shared public evidence is shown. Sparse evidence stays a ruled list rather than being closed into a radar shape.
A shared-evidence shape is not available.
BenchLM does not draw a radar or infer missing axes when the matched evidence is too sparse.
Each row shows the public-lane category score for both models: the BenchAlign v5.8 lane for agentic, coding, and knowledge, and the weighted public rows elsewhere, with the same rank each model page reports. A row is like-for-like only when both scores rest on Supported evidence or the same weighted set. Directional and not-comparable rows remain visible, but they never receive a winner.
| Category | GPT-5.2-Codex | Muse Spark Open | Basis | Reading |
|---|---|---|---|---|
| Coding | 43.6Supported · #56/150 | 56.1Supported · #29/150 | Like-for-likeBenchAlign v5.8 lane · 3 vs 0 public rows | Muse Spark Open leads · intervals overlap |
| Agentic | 40.9Estimated · #64/127 | 60.2Estimated · #27/127 | Directional onlyBenchAlign v5.8 lane · 2 vs 4 public rows | Directional only |
| Knowledge | 56.3Estimated · #54/184 | 64.6Supported · #38/184 | Directional onlyBenchAlign v5.8 lane · 0 vs 0 public rows | Directional only |
| Reasoning | 82.4Unranked · 2 rankable rows | 79.6Unranked · 2 rankable rows | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Multimodal | 76.9Unranked · 1 rankable row | 83.6Unranked · 4 rankable rows | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Multilingual | Not ranked | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Instruction following | 93.8#4/146 | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Math | Not ranked | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
Ranks count the models scored in each category’s lane, so the agentic, coding, and knowledge denominators (BenchAlign v5.8) differ from the provisional-lane categories. Unranked scores sit on the provisional lane’s scale but never name a winner. Like-for-like rows within 0.5 points read as a practical tie.
Three fixed token mixes turn per-token rates into comparable decisions. Each scenario states context fit and whether cached input had to fall back to the published list-input rate.
1K fresh input + 500 output tokens
Muse Spark Open has no comparable published API token rate.
50K fresh input + 3K output tokens
Muse Spark Open has no comparable published API token rate.
200K cached + 20K fresh input + 10K output tokens
GPT-5.2-Codex has no published cached-input rate, so cached tokens use its listed input rate. Muse Spark Open has no comparable published API token rate.
Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.
Maximum documented context; output-token limits may be lower.
GPT-5.2-Codex
400K
Muse Spark Open
GPT-5.2-Codex
Not sourced
Muse Spark Open
Not sourced
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
GPT-5.2-Codex
Not published
Muse Spark Open
No comparable hosted API rate
Meta AI Research blogGPT-5.2-Codex
Not sourced
Muse Spark Open
text, image, video, audio
Meta Muse Spark Open model cardGPT-5.2-Codex
Not sourced
Muse Spark Open
GPT-5.2-Codex
Not sourced
Muse Spark Open
Open Weights · Hugging Face, Amazon SageMaker AI, Google Cloud Model Garden, Microsoft Foundry Models, self-hosted inference
Meta AI Research: Muse Spark OpenGPT-5.2-Codex
Reasoning
Muse Spark Open
Reasoning
GPT-5.2-Codex
Proprietary
Muse Spark Open
Open Weight
GPT-5.2-Codex
Proprietary
Muse Spark Open
Open Weight
GPT-5.2-Codex
2025-12-18
Muse Spark Open
2026-10-15
Muse Spark Open has the higher public point estimate, 62.66 versus 55.29. Their conditional score ranges overlap. These ranges do not establish rank confidence. The page therefore keeps the decision tied to the specific documented workload.
Muse Spark Open has the higher public coding point estimate, 56.1 to 43.6, with Supported evidence for both models. The conditional ranges do not establish rank confidence.
Muse Spark Open scores higher for agentic tasks on the public lane, 60.2 to 40.9. GPT-5.2-Codex and Muse Spark Open are scored on Estimated evidence for agentic tasks, so the reading is directional rather than like-for-like. BenchLM does not name a winner for agentic tasks from a directional reading; read the shared benchmark rows directly and test the models on the same task set.
Both models do not have comparable published API token rates, so this page does not name a universal price winner.
Muse Spark Open has the larger documented context window: 1M, compared with 400K.
The full public result ledger is available for audit without forcing a wide desktop table onto a phone.
Gert Labs
Not directly comparable
JobBench
Muse Spark Open leads this result
MCP Atlas
Not directly comparable
HLE w/ tools
Not directly comparable
Toolathlon-Verified
Not directly comparable
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Last updated October 15, 2026
