gpt-5.6-luna
OpenAIdevelopers.openai.com/api/docs/models/gpt-5.6-lu
GPT-5.6 model optimized for cost-sensitive workloads
Updated 5 h ago · first seen 11 Sept 2026
model_01M293V76ZRTWE98GJGHREAFGX
Overview
Identity
Identity block not returned by the API for this entity.
Openness
Openness not classified yet — no sourced evidence to place this model in the ontology.
Key facts
- Release date
Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
- Knowledge cutoff
Source:OpenAI Platform docsT1observed 12 h agohigh
- Official page
Source:OpenAI Platform docsT1observed 12 h agohigh
- API model id
Source:OpenAI Platform docsT1observed 12 h agohigh
- Openrouter id
Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
Architecture
- Tokenizer
Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
Capabilities
Modalities
- Modalities
- imagetext
- Input
- textimage
- Output
- text
Capabilities
Tool calling
Yes
OpenAI Platform docs · T1
Structured output
Yes
OpenAI Platform docs · T1
Reasoning
Yes
OpenRouter public model & pricing listing · T2
Vision
Yes
OpenAI Platform docs · T1
Audio
Unavailable
Fine-tuning available
No
OpenAI Platform docs · T1
- Context window
Source:OpenAI Platform docsT1observed 12 h agohigh
- Max output
Source:OpenAI Platform docsT1observed 12 h agohigh
- Knowledge cutoff
Source:OpenAI Platform docsT1observed 12 h agohigh
- Tokenizer
Source:OpenRouter public model & pricing listingT2observed 12 h agomedium
Benchmarks15
Compare with another model →Comparable same task and conditions · Partially comparable same task, conditions differ (effort, temperature, judge) · Not comparable different variant or metric
No benchmark results recorded
Providers & Pricing3
All offers in the price terminal →USD per 1M tokens as published by each provider (USD). Rows are append-only: every change is kept in the history below.
Price history
Output price · USD / 1M tokens 1 provider
- OpenAI API
- OpenAI API$1.2 → $0.6011 Sept 2026
- OpenAI APIfirst observed $1.211 Sept 2026
Input price · USD / 1M tokens 1 provider
- OpenAI API
- OpenAI API$0.20 → $0.1011 Sept 2026
- OpenAI APIfirst observed $0.2011 Sept 2026
Timeline19
Full timeline →gpt-5.6-luna scores 60.121% on LiveBench
livebench_leaderboardgpt-5.6-luna scores 72.567% on LiveBench
livebench_leaderboardgpt-5.6-luna scores 78.033% on LiveBench
livebench_leaderboardgpt-5.6-luna scores 87.201% on LiveBench
livebench_leaderboardgpt-5.6-luna scores 48.434% on LiveBench
livebench_leaderboardgpt-5.6-luna scores 82.915% on LiveBench
livebench_leaderboardgpt-5.6-luna scores 85.644% on LiveBench
livebench_leaderboardgpt-5.6-luna scores 73.559% on LiveBench
livebench_leaderboardgpt-5.6-luna scores 80.9% on Terminal-Bench
artificial_analysisgpt-5.6-luna scores 11.62% on Terminal-Bench
artificial_analysisgpt-5.6-luna scores 39.48% on Humanity's Last Exam
artificial_analysisgpt-5.6-luna scores 37.5 on Artificial Analysis Intelligence Index
artificial_analysisOpenAI API lists gpt-5.6-luna at $0.1 in / $0.6 out per 1M tokens
openrouterOpenAI API lists gpt-5.6-luna at $0.2 in / $1.2 out per 1M tokens
openrouterOpenAI API lists gpt-5.6-luna at $0.2 in / $1.2 out per 1M tokens
openai
Change history24
Viewing AI Atlas as of 12 Sept 2026 — attributes exactly as the atlas knew them on that day; later corrections are not shown.
Back to today →Attributes as of 12 Sept 2026 28 claims in force
- Release date
- 9 Jul 2026
- Openness
- proprietary
- Context window
- 1.05M tokens
- Max output
- 128K tokens
- Knowledge cutoff
- Feb 2026
- Modalities
- image, text
- Input modalities
- text, image
- Output modalities
- text
- Tokenizer
- GPT
- API model id
- gpt-5.6-luna
- Official page
- Aa context window
- 1,000,000
- Aa openness
- proprietary
- Capabilities
- streaming, structured_outputs, function_calling, file_search, image_input, web_search, prompt_caching
- Default snapshot
- gpt-5.6-luna
- File input
- Yes
- Fine-tuning available
- No
- Aa median output tokens per second
- 104.6
- Openrouter id
- openai/gpt-5.6-luna
- Openrouter listed at
- 9 Jul 2026
- Reasoning
- Yes
- Snapshots
- gpt-5.6-luna
- Structured output
- Yes
- Supported parameters
- include_reasoning, max_completion_tokens, max_tokens, reasoning, reasoning_effort, response_format, seed, structured_outputs, tool_choice, tools
- Tool calling
- Yes
- Vision
- Yes
- Weights available
- No
Release daterelease_date1
Opennessopenness1
Context windowcontext_length1
Max outputmax_output_tokens1
Knowledge cutoffknowledge_cutoff1
Modalitiesmodalities1
Input modalitiesmodalities_input2conflicting claims
Output modalitiesmodalities_output1
Tokenizertokenizer1
API model idapi_model_id1
Official pageofficial_url1
Capabilitiescapabilities1
Default snapshotdefault_snapshot1
Descriptiondescription1
File inputfile_input1
Fine-tuning availablefine_tuning_available1
Openrouter idopenrouter_id1
Reasoningreasoning1
Snapshotssnapshots1
Structured outputstructured_output1
Supported parameterssupported_parameters1
Tool callingtool_calling1
Visionvision1
Claims are temporal and append-only: a new observation closes the previous claim (valid_to) instead of overwriting it. Conflicting claims from different sources are kept side by side and flagged — never averaged. Methodology →
Provenance
Attributed facts
25
Source tiers
T1T217 / 8
Freshest observation
5 h ago
Conflicts
5 flagged
Source documents 7
Tier 1 = official/primary, 2 = quality secondary, 3 = community, 4 = unverified. Every snapshot is archived; see all sources and the methodology.
Data quality (77/100) measures how well AI Atlas knows this entity — completeness, primary-source ratio, freshness, conflicts — never how good the model is. Methodology →