GPT 5.6 Terra Pro

GPT-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.

Reasoning
Vision
Native PDF input
Tool Calling
Structured Output

Added Jul 9, 2026

Pricing

Auto routing · per 1M tokens

Input: $2.00
Output: $12.00
Cache read: $0.20

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Specifications

Context window: 1.1M
Max output: 128K
Avg output (7d): 1.3K tokens; Longer than 80% of models

Benchmarks

Sourced from Artificial Analysis.

Intelligence Index

42.1

Better than 94% of models compared

Coding Index

76.7

Better than 96% of models compared

Agentic work

AutomationBench-AA

Workflow automation with guardrail penalties

59.6%

Better than 84% 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)

1333 Elo

Better than 72% of models compared

GDPval-AA v2

Economically valuable tasks (Elo)

1453 Elo

Better than 80% 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

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 77% of models compared

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

Last updated Oct 14, 2026

Artificial Analysis

Providers

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