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GPT-5.5×

Gemini 3.5×

Mistral Large 2×

	GPT-5.5 OpenAI	Gemini 3.5 Google	Mistral Large 2 Mistral	o3 OpenAI
Vendor	OpenAI	Google	Mistral	OpenAI
Family	GPT	Gemini	Mistral	o-series
Release date	2026-04-23	2026-05-20	2024-07-24	2025-04-16
Context window	400,000 tokens	2,000,000 tokens	128,000 tokens	200,000 tokens
Parameters	—	—	123B	—
Modality	text, vision, audio	text, vision, audio, video	text	text, vision
License	proprietary	proprietary	Mistral Research License	proprietary
Source	proprietary	proprietary	open weights	proprietary
Description	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.	Google DeepMind's next-gen Gemini — positioned as "frontier intelligence with action". Built for complex agentic workflows. Announced at Google I/O 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.	Reasoning-focused model in the o-series.
Links	vendor →	vendor →	vendor →weights →
Benchmarks
MMLU-Pro	87.6%	88.9%	—	—
GPQA-D	89.4%	91.2%	—	87.7%
HumanEval	96.8%	—	89.0%	—
Aider	89.7%	—	—	—
AIME-25	94.2%	96.1%	—	88.9%
LiveCB	78.9%	—	—	—
MMMU	78.4%	86.0%	—	—