Which LLM has the largest context window?

Grok 4.1 Fast currently leads with a 2 million token window. Gemini models run just over 1 million, and Claude Sonnet 5, GPT-5.4, DeepSeek V4, GLM-5.2, and Qwen3.7 also offer million-token windows.

How many words fit in a 200K context window?

Roughly 150,000 English words — about 600 pages. A million-token window fits around 750,000 words: several full-length books, or a mid-sized codebase.

Do models actually use the full window well?

Not uniformly. Most models recall the start and end of a prompt better than the middle, and effective context is often smaller than the advertised maximum. For critical retrieval over huge inputs, test with your own data and consider chunking plus retrieval instead of one giant prompt.

How do I keep long-context costs down?

Use cached input pricing: providers charge a fraction of the normal rate for re-sent, unchanged prefixes, which is exactly the shape of chatting over a large document or codebase. Structure prompts so the big static context comes first and only the question changes.

Long Context Models

Models with context windows of 200K tokens or more — up to 2M — for whole-codebase and multi-document workloads

Compare

162/290

Models

36/58

Providers

125

Vision Models (filtered)

153

Tool-enabled (filtered)

Free Models (filtered)


OpenAI	gpt-5.3-codex	$1.75	$14.00	$0.17
Azure	gpt-5.2-codex	$1.75	$14.00	$0.17
Azure	gpt-5.4-nano	$0.20	$1.25	$0.02
OpenAI	gpt-5.4-nano	$0.20	$1.25	$0.02
Azure	gpt-5.4-mini	$0.75	$4.50	$0.07
OpenAI	gpt-5.4-mini	$0.75	$4.50	$0.07
Azure	gpt-5.4-pro	$30.00	$180.00	—
OpenAI	gpt-5.4-pro	$30.00	$180.00	—
Azure	gpt-5.4	$2.50	$15.00	$0.25
OpenAI	gpt-5.4	$2.50	$15.00	$0.25
ByteDance	glm-4.7	$0.60	$2.20	$0.11
CanopyWave	glm-4.7	$0.43	$1.75	—
Cerebras	glm-4.7	$2.25	$2.75	—
EmberCloud	glm-4.7	$0.38	$1.98	$0.19
NovitaAI	glm-4.7	$0.60	$2.20	$0.11
Together AI	glm-4.7	$0.45	$2.00	—
Vertex AI (OpenAI-compatible)	glm-4.7	$0.60	$2.20	—
Z AI	glm-4.7	$0.60	$2.20	$0.11
ByteDance	seed-1-8-251228	$0.25	$2.00	$0.05
ByteDance	seed-1-6-flash-250715	$0.07	$0.30	$0.01
ByteDance	seed-1-6-250915	$0.25	$2.00	$0.05
ByteDance	seed-1-6-250615	$0.25	$2.00	$0.05
CanopyWave	minimax-m2.1	$0.27	$1.08	$0.07
NovitaAI	minimax-m2.1	$0.30	$1.20	$0.03
Azure AI Foundry	grok-4-1-fast-non-reasoning	$0.20	$0.50	—
Azure AI Foundry	grok-4-1-fast-reasoning	$0.20	$0.50	—
Google AI Studio	gemini-3-flash-preview	$0.50	$3.00	$0.05
Google Vertex AI	gemini-3-flash-preview	$0.50	$3.00	$0.05
Anthropic	claude-opus-4-5-20251101	$5.00	$25.00	$0.50
AWS Bedrock	claude-opus-4-5-20251101	$5.00	$25.00	$0.50
AWS Bedrock(eu)	claude-opus-4-5-20251101	$5.50	$27.50	$0.55
AWS Bedrock(global)	claude-opus-4-5-20251101	$5.00	$25.00	$0.50
AWS Bedrock(us)	claude-opus-4-5-20251101	$5.50	$27.50	$0.55
Google Vertex AI	claude-opus-4-5-20251101	$5.00	$25.00	$0.50
Vertex AI (Anthropic)	claude-opus-4-5-20251101	$5.00	$25.00	$0.50
Anthropic	claude-haiku-4-5-20251001	$1.00	$5.00	$0.10
AWS Bedrock	claude-haiku-4-5-20251001	$1.00	$5.00	$0.10
AWS Bedrock(au)	claude-haiku-4-5-20251001	$1.10	$5.50	$0.11
AWS Bedrock(eu)	claude-haiku-4-5-20251001	$1.10	$5.50	$0.11
AWS Bedrock(global)	claude-haiku-4-5-20251001	$1.00	$5.00	$0.10
AWS Bedrock(jp)	claude-haiku-4-5-20251001	$1.10	$5.50	$0.11
AWS Bedrock(us)	claude-haiku-4-5-20251001	$1.10	$5.50	$0.11
Google Vertex AI	claude-haiku-4-5-20251001	$1.00	$5.00	$0.10
Anthropic	claude-sonnet-4-5-20250929	$3.00	$15.00	$0.30
AWS Bedrock	claude-sonnet-4-5-20250929	$3.00	$15.00	$0.30
AWS Bedrock(au)	claude-sonnet-4-5-20250929	$3.30	$16.50	$0.33
AWS Bedrock(eu)	claude-sonnet-4-5-20250929	$3.30	$16.50	$0.33
AWS Bedrock(global)	claude-sonnet-4-5-20250929	$3.00	$15.00	$0.30
AWS Bedrock(jp)	claude-sonnet-4-5-20250929	$3.30	$16.50	$0.33
AWS Bedrock(us)	claude-sonnet-4-5-20250929	$3.30	$16.50	$0.33

Long Context Models

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