GPT-5.6 Terra is the balanced model in OpenAI's GPT-5.6 series, positioned between flagship Sol and cost-efficient Luna. It is suited for everyday coding, reasoning, agentic work, and general professional tasks.
Added Jul 9, 2026
Context Window
1.1M
Max Output
128.0K
Avg output tokens (7d)
304 tokens
Input Price (Auto)
$2.00/1M
Output Price (Auto)
$12.00/1M
Cache Read (Auto)
$0.20/1M
Capabilities
Benchmarks
Benchmarks
Performance metrics and benchmarks
Sourced from Artificial Analysis.
Intelligence Index
42.1
Coding Index
76.7
Agentic Index
43.2
Agentic work
AutomationBench-AA
Workflow automation with guardrail penalties
59.6%
Better than 85% of models compared
Harvey LAB-AA
Legal agentic work criterion pass rate
85.2%
Better than 42% of models compared
AA-Briefcase
Agentic knowledge work (Elo)
1334 Elo
Better than 73% of models compared
GDPval-AA v2
Economically valuable tasks (Elo)
1432 Elo
Better than 79% 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
83.0%
Better than 95% of models compared
MLCR-AA
Medical long-context reasoning
31.7%
Better than 81% of models compared
Reasoning
HLE
Humanity's Last Exam
42.9%
Better than 91% of models compared
IFBench
Instruction-following benchmark
71.2%
Better than 87% of models compared
CritPt
Research-level physics reasoning
30.0%
Coding
Terminal-Bench v4.0
Practical coding and terminal tasks
35.4%
Better than 85% of models compared
SciCode
Python programming for scientific computing
55.0%
Better than 76% of models compared
Knowledge
AA-Omniscience Accuracy
Proportion of correctly answered questions
46.8%
AA-Omniscience Hallucination Rate
Rate of incorrect answers among non-correct responses
87.9%
Legacy benchmarks
GPQA Diamond (legacy)
Graduate-level scientific reasoning
92.5%
Better than 94% of models compared
Terminal-Bench Hard (legacy)
Agentic coding and terminal use
57.6%
Better than 97% of models compared
T²-Bench Telecom (legacy)
Conversational AI agents in dual-control scenarios
86.3%
Better than 79% of models compared
AA-LCR (unversioned / legacy)
Long context reasoning evaluation
83.0%
Better than 95% of models compared
GDPval-AA (unversioned / legacy)
Economically valuable tasks
46.6%
Last updated Oct 1, 2026
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GPT 6 Sol Pro
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openai/gpt-astra-latestCompatibility alias that routes to GPT 6 Astra, the latest supported GPT Astra model.
GPT Luna Latest
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