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GPT-5.6 Sol×

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	GPT-5.6 Sol OpenAI	Grok 4 xAI	GPT-5 Pro OpenAI	Gemini 3 Pro Google
Vendor	OpenAI	xAI	OpenAI	Google
Family	GPT	Grok	GPT	Gemini
Release date	2026-06-26	2025-07-09	2025-08-07	2026-04-22
Context window	—	256,000 tokens	400,000 tokens	2,000,000 tokens
Parameters	—	—	—	—
Modality	text, vision, audio	text	text, vision, audio	text, vision, audio, video
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.	Google DeepMind's flagship multimodal model. Best-in-class for multimodal understanding and agentic / vibe coding workflows. A "Deep Think" reasoning mode is available to AI Ultra subscribers.
Links	vendor →	vendor →	vendor →	vendor →
Benchmarks
MMLU-Pro	—	82.8%	—	87.1%
GPQA-D	—	87.5%	—	88.6%
HumanEval	—	—	—	96.5%
Aider	—	72.5%	—	84.8%
AIME-25	—	86.1%	—	92.8%
LiveCB	—	65.3%	—	76.1%
MMMU	—	—	—	84.3%