GPT-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.
Added Jul 9, 2026
Context Window
1.1M
Max Output
128K
Input Price (Auto)
$2.00/1M
Output Price (Auto)
$10.00/1M
Cache Read (Auto)
$0.20/1M
Capabilities
Benchmarks
Benchmarks
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
47.0
Coding Index
77.4
Agentic work
AutomationBench-AA
Workflow automation with guardrail penalties
60.1%
Better than 88% of models compared
AutomationBench-AA Tasks Completed
Fully completed workflows without guardrail violations
30.3%
Better than 56% of models compared
Harvey LAB-AA
Legal agentic work criterion pass rate
87.2%
Better than 54% of models compared
AA-Briefcase
Agentic knowledge work (Elo)
1487 Elo
Better than 86% of models compared
GDPval-AA v2
Economically valuable tasks (Elo)
1588 Elo
Better than 90% of models compared
Document reasoning
GDP.pdf
Professional PDF reasoning: all-pass rate
27.2%
Better than 94% of models compared
AA-LCR v1.1
Long context reasoning with updated grading
84.0%
Better than 98% of models compared
MLCR-AA
Medical long-context reasoning
26.1%
Better than 79% of models compared
Reasoning
HLE
Humanity's Last Exam
49.5%
Better than 97% of models compared
IFBench
Instruction-following benchmark
72.7%
Better than 90% of models compared
Coding
Terminal-Bench v4.0
Practical coding and terminal tasks
39.9%
Better than 89% of models compared
SciCode
Python programming for scientific computing
57.1%
Better than 87% of models compared
Legacy benchmarks
GPQA Diamond (legacy)
Graduate-level scientific reasoning
94.1%
Better than 99% of models compared
Terminal-Bench Hard (legacy)
Agentic coding and terminal use
65.9%
Better than 99% of models compared
T²-Bench Telecom (legacy)
Conversational AI agents in dual-control scenarios
85.1%
Better than 77% of models compared
AA-LCR (unversioned / legacy)
Long context reasoning evaluation
84.0%
Better than 98% of models compared
Last updated Sep 28, 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 Sol 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 6 Luna Pro
openai/gpt-6-luna-proGPT-6 Luna Pro uses the same underlying model as GPT-6 Luna with Pro reasoning mode enabled for higher-quality responses on complex tasks.
GPT 6 Sol
openai/gpt-6-solGPT-6 Sol is the cost-efficient high-end model in OpenAI's GPT-6 series, positioned below the flagship GPT-6 Astra and above the fast GPT-6 Luna tier. It is suited for demanding professional work, reasoning, coding, and agentic workflows.
GPT Sol Latest
openai/gpt-sol-latestCompatibility alias that routes to GPT 6 Sol, the latest supported GPT Sol 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 Pro
openai/gpt-5.6-luna-proGPT-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.