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	GPT-5.5 OpenAI	Claude 4.6 Sonnet Anthropic	Gemini 3.5 Google	GPT-5 OpenAI
Vendor	OpenAI	Anthropic	Google	OpenAI
Family	GPT	Claude	Gemini	GPT
Release date	2026-04-23	2026-02-17	2026-05-20	2025-08-07
Context window	400,000 tokens	1,000,000 tokens	2,000,000 tokens	400,000 tokens
Parameters	—	—	—	—
Modality	text, vision, audio	text, vision	text, vision, audio, video	text, vision, audio
License	proprietary	proprietary	proprietary	proprietary
Source	proprietary	proprietary	proprietary	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.	Anthropic's mid-tier flagship — released 12 days after Opus 4.6 and matching most of its capabilities at ~40% the API cost ($3/$15 per 1M tokens). 1M-token context.	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 flagship general-purpose model. Superseded by GPT-5.5 in April 2026.
Links	vendor →		vendor →	vendor →
Benchmarks
MMLU-Pro	87.6%	85.4%	88.9%	85.1%
GPQA-D	89.4%	85.8%	91.2%	87.3%
HumanEval	96.8%	95.9%	—	95.2%
Aider	89.7%	83.6%	—	85.4%
AIME-25	94.2%	87.4%	96.1%	91.0%
LiveCB	78.9%	73.8%	—	74.5%
MMMU	78.4%	—	86.0%	74.1%