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GPT-5.6 Sol×

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	GPT-5.6 Sol OpenAI	GPT-5 Pro OpenAI	Qwen3.7-Max Alibaba	GPT-5 OpenAI
Vendor	OpenAI	OpenAI	Alibaba	OpenAI
Family	GPT	GPT	Qwen	GPT
Release date	2026-06-26	2025-08-07	2026-05-20	2025-08-07
Context window	—	400,000 tokens	1,000,000 tokens	400,000 tokens
Parameters	—	—	—	—
Modality	text, vision, audio	text, vision, audio	text	text, vision, audio
License	proprietary	proprietary	proprietary	proprietary
Source	proprietary	proprietary	proprietary	proprietary
Description	Flagship of OpenAI's GPT-5.6 three-model suite (Sol / Terra / Luna), released as a limited preview. Strong gains in coding, cybersecurity, biology, and long-horizon agentic work. Pricing: $5 / $30 per million input/output tokens.	Higher-reasoning variant of GPT-5, used for harder scientific and research tasks (e.g., immunology breakthroughs at NIH). Same 400K context as GPT-5; trades latency for depth.	Alibaba's flagship agent model — 1M-token context, extended-thinking mode, 56.6 on the Artificial Analysis Intelligence Index v4.0 (5th overall, #1 Chinese). 50.8% on Terminal-Bench Hard. Designed for long-horizon agent workloads (hundreds-to-thousands of steps). Closed-weight, $2.50/$7.50 per 1M tokens.	OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026.
Links	vendor →	vendor →	vendor →	vendor →
Benchmarks
MMLU-Pro	—	—	83.7%	85.1%
GPQA-D	—	—	83.0%	87.3%
HumanEval	—	—	93.9%	95.2%
Aider	—	—	78.4%	85.4%
AIME-25	—	—	90.4%	91.0%
LiveCB	—	—	71.0%	74.5%
MMMU	—	—	—	74.1%