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	GPT-5 OpenAI	Mistral Large 2 Mistral	Gemini 3.5 Google	GPT-5.5 OpenAI
Vendor	OpenAI	Mistral	Google	OpenAI
Family	GPT	Mistral	Gemini	GPT
Release date	2025-08-07	2024-07-24	2026-05-20	2026-04-23
Context window	400,000 tokens	128,000 tokens	2,000,000 tokens	400,000 tokens
Parameters	—	123B	—	—
Modality	text, vision, audio	text	text, vision, audio, video	text, vision, audio
License	proprietary	Mistral Research License	proprietary	proprietary
Source	proprietary	open weights	proprietary	proprietary
Description	OpenAI's flagship general-purpose model. Superseded by GPT-5.5 in April 2026.	Large text-only Mistral model with a 128K context window and 123B parameters, tuned for strong instruction following and long-context reasoning. Mistral's flagship open-weights release in the Large 2 line.	Google DeepMind's next-gen Gemini — positioned as "frontier intelligence with action". Built for complex agentic workflows. Announced at Google I/O 2026.	OpenAI's smartest and most intuitive model — successor to GPT-5, with major coding, research, and document workflow gains. GPT-5.5 Pro variant also available for heavier reasoning.
Links	vendor →	vendor →weights →	vendor →	vendor →
Benchmarks
MMLU-Pro	85.1%	—	88.9%	87.6%
GPQA-D	87.3%	—	91.2%	89.4%
HumanEval	95.2%	89.0%	—	96.8%
Aider	85.4%	—	—	89.7%
AIME-25	91.0%	—	96.1%	94.2%
LiveCB	74.5%	—	—	78.9%
MMMU	74.1%	—	86.0%	78.4%