#13OpenAI· released 2026-07-09

OpenAI: GPT-5.6 Terra Pro.

GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

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Context
1.1M
Input $/1M
$2.50
Output $/1M
$15.00
Modality
file · image · text

Benchmarks

How these are aggregated →
Arena Elo
1505
LMArena — human blind votes
AA Index
63.0
Artificial Analysis composite
LiveBench
77.5
Contamination-resistant
GPQA
85.1%
Grad-level science reasoning
MMLU-Pro
86.4%
Broad knowledge
SWE-bench
70.4%
Real GitHub bugs (Verified)
Terminal-Bench
49.3%
Agentic shell tasks
ARC-AGI
17.3%
Abstract reasoning
Aider Polyglot
79.4%
Multi-language code editing
Speed
89 tok/s
Median output speed

Nearby on the leaderboard