Updated October 7, 2026. Rank cannot separate these two. Price, access, and your workload decide. 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
GPT-5.6 Luna has the higher public score estimate, 65.98 versus 65.95, but the 90% score intervals overlap. Treat that as a lead, not a settled winner. 12 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
GPT-5.6 Luna
GPT-5.6 Luna has the higher public coding point estimate, 63.4 to 54.2, with Supported evidence for both models. The conditional ranges do not establish rank confidence.
Tool use, computer use, and multi-step task completion
Muse Spark 1.1
Muse Spark 1.1 has the higher public agentic point estimate, 56.9 to 54.9, with Supported evidence for both models. The conditional ranges do not establish rank confidence.
Prompts that approach the documented context limit
GPT-5.6 Luna
GPT-5.6 Luna has the larger documented context window.
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
GPT-5.6 Luna 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.
Only shared public evidence is shown. Sparse evidence stays a ruled list rather than being closed into a radar shape.
Too few matched category axes support a radar. The ruled list below shows only shared benchmark results; positions use each benchmark’s normalized display scale when available.
OSWorld 2.0Agentic
Normalized gap 31.4MMLU-Pro (Vals)Knowledge
Normalized gap 2.7SWE-bench ProCoding
Normalized gap 1.2Each 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-5.6 Luna | Muse Spark 1.1 | Basis | Reading |
|---|---|---|---|---|
| Agentic | 54.9Supported · #36/122 | 56.9Supported · #32/122 | Like-for-likeBenchAlign v5.8 lane · 9 vs 14 public rows | Muse Spark 1.1 leads · intervals overlap |
| Coding | 63.4Supported · #13/146 | 54.2Supported · #35/146 | Like-for-likeBenchAlign v5.8 lane · 8 vs 4 public rows | GPT-5.6 Luna leads · intervals overlap |
| Knowledge | 64.5Supported · #25/174 | 66.7Supported · #21/174 | Like-for-likeBenchAlign v5.8 lane · 6 vs 5 public rows | Muse Spark 1.1 leads · intervals overlap |
| Reasoning | 54.5#26/28 | 75.7Unranked · 3 rankable rows | Not comparableProvisional lane · 2 vs 0 weighted rows | Not comparable |
| Multimodal | 68.1#21/49 | 78.3Unranked · 2 rankable rows | Not comparableProvisional lane · 1 vs 1 weighted rows | Not comparable |
| Multilingual | Not ranked | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Instruction following | Not ranked | Not ranked | Not comparableProvisional lane · 0 vs 0 weighted rows | Not comparable |
| Math | 94.2Unranked · 3 rankable rows | Not ranked | Not comparableProvisional lane · 2 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 1.1 has no comparable published API token rate.
50K fresh input + 3K output tokens
Muse Spark 1.1 has no comparable published API token rate.
200K cached + 20K fresh input + 10K output tokens
Muse Spark 1.1 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-5.6 Luna
1.05M
OpenAI model catalogMuse Spark 1.1
1M
GPT-5.6 Luna
gpt-5.6-luna
OpenAI model catalogMuse Spark 1.1
Not sourced
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
GPT-5.6 Luna
$0.02 per 1M cached input tokens
OpenAI pricingMuse Spark 1.1
No comparable hosted API rate
GPT-5.6 Luna
text, image
OpenAI model catalogMuse Spark 1.1
Not sourced
GPT-5.6 Luna
Muse Spark 1.1
Not sourced
GPT-5.6 Luna
Generally Available · OpenAI Responses API
OpenAI model catalogMuse Spark 1.1
Not sourced
GPT-5.6 Luna
Reasoning
Muse Spark 1.1
Reasoning
GPT-5.6 Luna
Proprietary
Muse Spark 1.1
Proprietary
GPT-5.6 Luna
Proprietary
Muse Spark 1.1
Proprietary
GPT-5.6 Luna
2026-07-09
Muse Spark 1.1
2026-07-09
GPT-5.6 Luna has the higher public score estimate, 65.98 versus 65.95, but the 90% score intervals overlap. The higher estimate is not a decisive winner because the uncertainty ranges overlap.
GPT-5.6 Luna has the higher public coding point estimate, 63.4 to 54.2, with Supported evidence for both models. The conditional ranges do not establish rank confidence.
Muse Spark 1.1 has the higher public agentic tasks point estimate, 56.9 to 54.9, with Supported evidence for both models. The conditional ranges do not establish rank confidence.
Both models do not have comparable published API token rates, so this page does not name a universal price winner.
GPT-5.6 Luna has the larger documented context window: 1.05M, compared with 1M.
The full public result ledger is available for audit without forcing a wide desktop table onto a phone.
Terminal-Bench 3.0
Not directly comparable
Terminal-Bench 2.1
GPT-5.6 Luna leads this result
BrowseComp
Not directly comparable
OSWorld 2.0
GPT-5.6 Luna leads this result
CyberGym
GPT-5.6 Luna leads this result
ExploitGym
GPT-5.6 Luna leads this result
Toolathlon
Muse Spark 1.1 leads this result
Terminal-Bench 2.1 (Vals)
GPT-5.6 Luna leads this result
ApprenticeBench
Not directly comparable
MCP Atlas
Not directly comparable
OSWorld-Verified
Not directly comparable
WebArena-Verified
Not directly comparable
DeepSearchQA
Not directly comparable
Finance Agent v2
Not directly comparable
deepSwe
Not directly comparable
JobBench
Not directly comparable
Cybench
Not directly comparable
SWE-bench Pro
GPT-5.6 Luna leads this result
Terminal-Bench 2.1
GPT-5.6 Luna leads this result
DeepSWE
Not directly comparable
FrontierCode 1.1 Extended
Not directly comparable
CursorBench 3.2
Not directly comparable
VulcanBench v3
Not directly comparable
SWE-bench (Vals)
GPT-5.6 Luna leads this result
CursorBench 4.0
Not directly comparable
LiveCodeBench (Vals)
Not directly comparable
GPQA
Not directly comparable
GPQA-D
Not directly comparable
HealthBench Professional
Muse Spark 1.1 leads this result
HealthBench Hard
Not directly comparable
GPQA Diamond (Vals)
GPT-5.6 Luna leads this result
MMLU-Pro (Vals)
Muse Spark 1.1 leads this result
HLE
Not directly comparable
HLE w/o tools
Not directly comparable
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Last updated October 7, 2026
