none · low · medium · high · xhigh · max · default medium
Only provider-documented reasoning controls are shown; missing controls remain unpublished rather than inferred.
MODEL REFERENCE / OPENAI
GPT-5.6 Luna
verified model reference.
Lowest-cost GPT-5.6 tier for cost-sensitive, high-volume workloads.
1,050,000context tokens
128,000max output
2026-09-27last verified
PRIMARY-SOURCE VERIFIED
GPT-5.6 Luna at a glance.
OpenAI documents a 1,050,000-token context window. Input modalities: text + image. Output: text. Pricing status: Official paid API.
MODEL IDgpt-5.6-luna
CONTEXT WINDOW1,050,000tokens
MAX OUTPUT128,000
KNOWLEDGE CUTOFF2026-02-16
STANDARD INPUT$0.20per 1 million tokens
STANDARD OUTPUT$1.20per 1 million tokens
CAPABILITY CONTRACT
Published model behavior.
text + image
Input modalities come from the cited official model documentation.
text
Output modality and output-limit claims remain separate so an undocumented token cap is not guessed.
PRICING STATUS
Official paid API.
$0.20 input · $0.02 cached · $1.20 output per 1 million tokens.
SXF preserves the provider-published native billing basis. Only calculator-eligible generative token models enter token-cost arithmetic; specialist units and input-only embeddings remain visible without forced conversion.
EXPLORE
Keep the model in context.
OFFICIAL SOURCES
Verification links.
WHAT CHANGED
GPT-5.6 Luna: what changed.
No post-baseline factual changes recorded for GPT-5.6 Luna since 2026-09-27.
VERIFIED BASELINE2026-09-27Current facts remain aligned with the SXF ledger.
VERIFIED CHANGE HISTORY
GPT-5.6 Luna verified history.
GPT-5.6 Luna
Baseline verified: 1,050,000 context · 128,000 max output · $0.20 input / $0.02 cached / $1.20 output per 1 million tokens
Official evidence ↗Append-only SXF ledger · 1 verified event · chain head 5cb61a0bb057…
COMPARE GPT-5.6 LUNA
Put this model in context.
EVALUATION EVIDENCE
GPT-5.6 Luna benchmark observations.
independentArtificial Analysis
AA-Briefcase 1.1
1,267 Eloagentic knowledge work · reasoning xhigh
Evidence ↗independentArtificial Analysis
Artificial Analysis Intelligence Index 4.3.2
35composite intelligence · reasoning xhigh
Evidence ↗independentArtificial Analysis
AA-LCR 1.1
82.0%long context reasoning · reasoning xhigh
Evidence ↗independentArtificial Analysis
AutomationBench-AA
43.0%business automation · reasoning xhigh
Evidence ↗independentArtificial Analysis · under review
CritPt
21.0%frontier science reasoning · reasoning xhigh
Evidence ↗independentArtificial Analysis
GDPval-AA 2.1
1,403 Eloprofessional knowledge work · reasoning xhigh
Evidence ↗independentArtificial Analysis
Humanity's Last Exam
37.0%multidisciplinary reasoning · reasoning xhigh
Evidence ↗independentArtificial Analysis · under review
SciCode
50.0%scientific coding · reasoning xhigh
Evidence ↗Scores are shown only with their evaluator, benchmark version and model configuration. They are not merged into a universal model score.