GPT-5.6 Luna with Pro reasoning mode. Pro mode performs more model work for difficult tasks; reasoning effort remains independently configurable and defaults to medium.
Added Jul 9, 2026
Context Window
1.1M
Max Output
128.0K
Avg output tokens (7d)
1.5K tokens
Input Price (Auto)
$0.20/1M
Output Price (Auto)
$1.20/1M
Cache Read (Auto)
$0.020/1M
Capabilities
Benchmarks
Benchmarks
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
37.3
Coding Index
71.4
Agentic work
AutomationBench-AA
Workflow automation with guardrail penalties
50.2%
Better than 67% of models compared
Harvey LAB-AA
Legal agentic work criterion pass rate
87.9%
Better than 49% of models compared
AA-Briefcase
Agentic knowledge work (Elo)
1344 Elo
Better than 74% of models compared
GDPval-AA v2
Economically valuable tasks (Elo)
1463 Elo
Better than 82% of models compared
Document reasoning
GDP.pdf
Professional PDF reasoning: all-pass rate
24.0%
Better than 82% of models compared
AA-LCR v1.1
Long context reasoning with updated grading
83.7%
Better than 97% of models compared
MLCR-AA
Medical long-context reasoning
19.4%
Better than 65% of models compared
Reasoning
HLE
Humanity's Last Exam
39.5%
Better than 87% of models compared
Coding
Terminal-Bench v4.0
Practical coding and terminal tasks
11.6%
Better than 64% of models compared
SciCode
Python programming for scientific computing
53.6%
Better than 69% of models compared
Legacy benchmarks
GPQA Diamond (legacy)
Graduate-level scientific reasoning
91.1%
Better than 91% of models compared
AA-LCR (unversioned / legacy)
Long context reasoning evaluation
83.7%
Better than 97% of models compared
Last updated Oct 1, 2026
Artificial AnalysisProviders
Auto routing is available for this model. Explicit provider selection is not available.
Loading provider options…
Related text models
Compare GPT 5.6 Luna Pro with similar models from the same provider or model family.
GPT 6 Sol Pro
openai/gpt-6-sol-proGPT-6 Sol Pro uses the same underlying model as GPT-6 Sol with Pro reasoning mode enabled for higher-quality responses on complex tasks.
GPT Luna Latest
openai/gpt-luna-latestCompatibility alias that routes to GPT 5.6 Luna, the latest supported GPT Luna model.
GPT 6 Astra Pro
openai/gpt-6-astra-proGPT 6 Astra in Pro reasoning mode. Uses additional model work for difficult tasks, with higher latency and token usage at the same per-token rates. Reasoning effort remains independently configurable.
GPT 5.6 Luna
openai/gpt-5.6-lunaGPT-5.6 Luna is the fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume chat, classification, lightweight agentic workflows, and latency-sensitive reasoning tasks.
GPT 5.6 Sol Pro
openai/gpt-5.6-sol-proGPT-5.6 Sol with Pro reasoning mode. Pro mode performs more model work for difficult tasks; reasoning effort remains independently configurable and defaults to medium.
GPT 5.6 Terra Pro
openai/gpt-5.6-terra-proGPT-5.6 Terra with Pro reasoning mode. Pro mode performs more model work for difficult tasks; reasoning effort remains independently configurable and defaults to medium.