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

163/307

Models

45/63

Providers

114

Vision Models (filtered)

161

Tool-enabled (filtered)

Free Models (filtered)


AWS Bedrock(us)	claude-opus-5	$5.50	$27.50	$0.55
AWS Bedrock(global)	claude-opus-5	$5.00	$25.00	$0.50
AWS Bedrock(eu)	claude-opus-5	$5.50	$27.50	$0.55
AWS Bedrock	claude-opus-5	$5.00	$25.00	$0.50
Azure Anthropic	claude-opus-5	$5.00	$25.00	$0.50
S OpenRouter	glm-5.2	$0.80	$2.52	$0.15
Z AI	glm-5.2	$1.40	$4.40	$0.26
Runware	glm-5.2	$0.80	$2.55	$0.16
S GapGPT	glm-5.2	$1.40	$4.40	$0.28
SCX.ai	glm-5.2	$0.55	$1.78	$0.11
Alibaba Cloud(eu-frankfurt)	glm-5.2	$1.40	$4.40	$0.28
Alibaba Cloud(us-virginia)	glm-5.2	$1.40	$4.40	$0.28
Alibaba Cloud(cn-beijing)	glm-5.2	$1.40	$4.40	$0.28
NovitaAI	glm-5.2	$1.40	$4.40	$0.26
Baidu	glm-5.2	$1.40	$4.40	$0.26
Alibaba Cloud	glm-5.2	$1.40	$4.40	$0.28
ByteDance	glm-5.2	$1.40	$4.40	$0.26
Alibaba Cloud(singapore)	glm-5.2	$1.40	$4.40	$0.28
EmberCloud	glm-5.2	$1.26	$3.96	$0.23
CanopyWave	glm-5.2	$1.40	$4.40	$0.26
S AvalAI	glm-5.2	$1.40	$4.40	$0.26
DeepInfra	nemotron-3-ultra-550b	$0.50	$2.20	$0.10
S OpenRouter	nemotron-3-ultra-550b	$0.60	$3.60	$0.20
S OpenRouter	fugu-ultra	$5.00	$30.00	$0.50
Sakana AI	fugu-ultra	$5.00	$30.00	$0.50
S GapGPT	gapgpt-qwen-3.6-thinking	$0.25	$2.00	—
S GapGPT	gapgpt-qwen-3.6	$0.25	$2.00	—
Alibaba Cloud(eu-frankfurt)	qwen3.6-flash	$0.17	$0.99	$0.03
S OpenRouter	qwen3.6-flash	$0.19	$1.13	—
S AvalAI	qwen3.6-flash	$0.25	$1.50	$0.02
Alibaba Cloud(cn-beijing)	qwen3.6-flash	$0.17	$0.99	$0.03
Alibaba Cloud	qwen3.6-flash	$0.25	$1.50	$0.05
Alibaba Cloud(us-virginia)	qwen3.6-flash	$0.17	$0.99	$0.03
Alibaba Cloud(singapore)	qwen3.6-flash	$0.25	$1.50	$0.05
Alibaba Cloud(us-virginia)	qwen3.7-plus	$0.28	$1.10	$0.06
Alibaba Cloud	qwen3.7-plus	$0.40	$1.60	$0.08
Alibaba Cloud(cn-beijing)	qwen3.7-plus	$0.28	$1.10	$0.06
Alibaba Cloud(eu-frankfurt)	qwen3.7-plus	$0.28	$1.10	$0.06
S AvalAI	qwen3.7-plus	$0.40	$1.60	$0.04
Alibaba Cloud(singapore)	qwen3.7-plus	$0.40	$1.60	$0.08
S OpenRouter	qwen3.7-plus	$0.32	$1.28	$0.06
S AvalAI	qwen3.7-max	$2.50	$7.50	$0.25
Alibaba Cloud(eu-frankfurt)	qwen3.7-max	$1.65	$4.95	$0.33
Alibaba Cloud	qwen3.7-max	$2.50	$7.50	$0.50
Alibaba Cloud(singapore)	qwen3.7-max	$2.50	$7.50	$0.50
S OpenRouter	qwen3.7-max	$1.48	$4.42	$0.29
Alibaba Cloud(us-virginia)	qwen3.7-max	$1.65	$4.95	$0.33
Alibaba Cloud(cn-beijing)	qwen3.7-max	$1.65	$4.95	$0.33
NovitaAI	qwen3.7-max	$1.25	$3.75	$0.25
DeepInfra	qwen3.5-9b	$0.10	$0.15	—

Long Context Models

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

Compare

163/307

Models

45/63

Providers

114

Vision Models (filtered)

161

Tool-enabled (filtered)

Free Models (filtered)


AWS Bedrock(us)	claude-opus-5	$5.50	$27.50	$0.55
AWS Bedrock(global)	claude-opus-5	$5.00	$25.00	$0.50
AWS Bedrock(eu)	claude-opus-5	$5.50	$27.50	$0.55
AWS Bedrock	claude-opus-5	$5.00	$25.00	$0.50
Azure Anthropic	claude-opus-5	$5.00	$25.00	$0.50
S OpenRouter	glm-5.2	$0.80	$2.52	$0.15
Z AI	glm-5.2	$1.40	$4.40	$0.26
Runware	glm-5.2	$0.80	$2.55	$0.16
S GapGPT	glm-5.2	$1.40	$4.40	$0.28
SCX.ai	glm-5.2	$0.55	$1.78	$0.11
Alibaba Cloud(eu-frankfurt)	glm-5.2	$1.40	$4.40	$0.28
Alibaba Cloud(us-virginia)	glm-5.2	$1.40	$4.40	$0.28
Alibaba Cloud(cn-beijing)	glm-5.2	$1.40	$4.40	$0.28
NovitaAI	glm-5.2	$1.40	$4.40	$0.26
Baidu	glm-5.2	$1.40	$4.40	$0.26
Alibaba Cloud	glm-5.2	$1.40	$4.40	$0.28
ByteDance	glm-5.2	$1.40	$4.40	$0.26
Alibaba Cloud(singapore)	glm-5.2	$1.40	$4.40	$0.28
EmberCloud	glm-5.2	$1.26	$3.96	$0.23
CanopyWave	glm-5.2	$1.40	$4.40	$0.26
S AvalAI	glm-5.2	$1.40	$4.40	$0.26
DeepInfra	nemotron-3-ultra-550b	$0.50	$2.20	$0.10
S OpenRouter	nemotron-3-ultra-550b	$0.60	$3.60	$0.20
S OpenRouter	fugu-ultra	$5.00	$30.00	$0.50
Sakana AI	fugu-ultra	$5.00	$30.00	$0.50
S GapGPT	gapgpt-qwen-3.6-thinking	$0.25	$2.00	—
S GapGPT	gapgpt-qwen-3.6	$0.25	$2.00	—
Alibaba Cloud(eu-frankfurt)	qwen3.6-flash	$0.17	$0.99	$0.03
S OpenRouter	qwen3.6-flash	$0.19	$1.13	—
S AvalAI	qwen3.6-flash	$0.25	$1.50	$0.02
Alibaba Cloud(cn-beijing)	qwen3.6-flash	$0.17	$0.99	$0.03
Alibaba Cloud	qwen3.6-flash	$0.25	$1.50	$0.05
Alibaba Cloud(us-virginia)	qwen3.6-flash	$0.17	$0.99	$0.03
Alibaba Cloud(singapore)	qwen3.6-flash	$0.25	$1.50	$0.05
Alibaba Cloud(us-virginia)	qwen3.7-plus	$0.28	$1.10	$0.06
Alibaba Cloud	qwen3.7-plus	$0.40	$1.60	$0.08
Alibaba Cloud(cn-beijing)	qwen3.7-plus	$0.28	$1.10	$0.06
Alibaba Cloud(eu-frankfurt)	qwen3.7-plus	$0.28	$1.10	$0.06
S AvalAI	qwen3.7-plus	$0.40	$1.60	$0.04
Alibaba Cloud(singapore)	qwen3.7-plus	$0.40	$1.60	$0.08
S OpenRouter	qwen3.7-plus	$0.32	$1.28	$0.06
S AvalAI	qwen3.7-max	$2.50	$7.50	$0.25
Alibaba Cloud(eu-frankfurt)	qwen3.7-max	$1.65	$4.95	$0.33
Alibaba Cloud	qwen3.7-max	$2.50	$7.50	$0.50
Alibaba Cloud(singapore)	qwen3.7-max	$2.50	$7.50	$0.50
S OpenRouter	qwen3.7-max	$1.48	$4.42	$0.29
Alibaba Cloud(us-virginia)	qwen3.7-max	$1.65	$4.95	$0.33
Alibaba Cloud(cn-beijing)	qwen3.7-max	$1.65	$4.95	$0.33
NovitaAI	qwen3.7-max	$1.25	$3.75	$0.25
DeepInfra	qwen3.5-9b	$0.10	$0.15	—

Long Context Models

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Long Context Models

Stay ahead of the curve

Frequently asked questions

Which LLM has the largest context window?

How many words fit in a 200K context window?

Do models actually use the full window well?

How do I keep long-context costs down?