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GPT-5.5×

Gemini 3 Pro×

Claude 4.8 Opus×

	GPT-5.5 OpenAI	Gemini 3 Pro Google	Claude 4.8 Opus Anthropic	o3 OpenAI
Vendor	OpenAI	Google	Anthropic	OpenAI
Family	GPT	Gemini	Claude	o-series
Release date	2026-04-23	2026-04-22	2026-05-28	2025-04-16
Context window	400,000 tokens	2,000,000 tokens	1,000,000 tokens	200,000 tokens
Parameters	—	—	—	—
Modality	text, vision, audio	text, vision, audio, video	text, vision	text, vision
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.	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.	Anthropic's flagship hybrid-reasoning model — Opus 4.8 pushes coding and AI-agent workflows further (agentic coding 69.2% vs 64.3% on 4.7; multidisciplinary reasoning 57.9% vs 54.7%). 1M-token context, $5/$25 per MTok pricing held flat from Opus 4.7. Introduces Dynamic Workflows for Claude Code (research preview). GA on Anthropic API (`claude-opus-4-8`), AWS Bedrock, Google Vertex, Microsoft Foundry, and GitHub Copilot.	Reasoning-focused model in the o-series.
Links	vendor →	vendor →	vendor →
Benchmarks
MMLU-Pro	87.6%	87.1%	—	—
GPQA-D	89.4%	88.6%	—	87.7%
HumanEval	96.8%	96.5%	—	—
Aider	89.7%	84.8%	—	—
AIME-25	94.2%	92.8%	—	88.9%
LiveCB	78.9%	76.1%	—	—
MMMU	78.4%	84.3%	—	—