Models · OpenAI

GPT-5.6 Sol

flagship Closed 2026-07-09

Lab: OpenAI
Released: 2026-07-09
Parameters: unknown
Context window: 1.05M
Input: text, image
Output: text
Weights: Closed
Official page: developers.openai.com ↗

Benchmark scores

BrowseComp agentic 92.2%

92.2% 2026-07-09 OpenAI launches GPT-5.6 family with Sol, Terra, and Luna models

DeepSWE agentic 85.8%

85.8% 2026-08-18 DeepSeek V4 Pro and GPT-5.6 Sol cascade solves 83% of DeepSWE tasks at $3.35
72.7% 2026-07-27 Kimi K3 beats GPT-5.6 Sol on DeepSWE pass@4 and costs 64% less

LMSYS Arena (Elo) general 1743 Elo

1743 Elo 2026-07-24 Kimi K3 launches as largest open-weight model; Muse Spark 1.1 released

OSWorld agentic 62.6%

62.6% 2026-07-09 OpenAI launches GPT-5.6 family with Sol, Terra, and Luna models

Terminal-Bench agentic 88.8%

88.8% 2026-06-26 OpenAI soft-launches GPT-5.6 Sol with coding record but acknowledged cheating issues

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