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

Models

Providers

114

Vision Models

160

Tool-enabled

Free Models


OpenAI	gpt-5.4	$2.50	$15.00	$0.25
Azure	gpt-5.4	$2.50	$15.00	$0.25
S GapGPT	gpt-5.4	$2.50	$15.00	$0.25
S AvalAI	gpt-5.4	$2.50	$15.00	$0.25
S OpenRouter	gpt-5.4	$2.50	$15.00	$0.25
S Metis	gpt-5.4	$2.50	$15.00	$0.25
Azure	o4-mini	$1.10	$4.40	$0.28
S AvalAI	o4-mini	$1.10	$4.40	$0.55
S OpenRouter	o4-mini	$1.10	$4.40	$0.28
OpenAI	o4-mini	$1.10	$4.40	$0.28
AWS Bedrock	claude-opus-4-6	$5.00	$25.00	$0.50
S AvalAI	claude-opus-4-6	$5.00	$25.00	$1.50
AWS Bedrock(eu-west-2)	claude-opus-4-6	$5.50	$27.50	$0.55
S GapGPT	claude-opus-4-6	$5.00	$25.00	$0.50
S OpenRouter	claude-opus-4-6	$5.00	$25.00	$0.50
AWS Bedrock(us)	claude-opus-4-6	$5.50	$27.50	$0.55
AWS Bedrock(eu)	claude-opus-4-6	$5.50	$27.50	$0.55
AWS Bedrock(au)	claude-opus-4-6	$5.50	$27.50	$0.55
AWS Bedrock(global)	claude-opus-4-6	$5.00	$25.00	$0.50
Vertex AI (Anthropic)	claude-opus-4-6	$5.00	$25.00	$0.50
Anthropic	claude-opus-4-6	$5.00	$25.00	$0.50
Z AI	glm-4.6	$0.60	$2.20	$0.11
NovitaAI	glm-4.6	$0.55	$2.20	$0.11
S OpenRouter	glm-4.6	$0.50	$2.00	$0.10
S OpenRouter	glm-4.7-flash	$0.06	$0.40	—
EmberCloud	glm-4.7-flash	$0.06	$0.40	$0.01
Z AI	glm-4.7-flashx	$0.07	$0.40	$0.01
S OpenRouter	glm-4.7	$0.40	$1.75	$0.08
ByteDance	glm-4.7	$0.60	$2.20	$0.11
Cerebras	glm-4.7	$2.25	$2.75	—
Vertex AI (OpenAI-compatible)	glm-4.7	$0.60	$2.20	—
Z AI	glm-4.7	$0.60	$2.20	$0.11
Together AI	glm-4.7	$0.45	$2.00	—
EmberCloud	glm-4.7	$0.38	$1.98	$0.19
S Hormouz	glm-4.7	$0.60	$2.20	$0.11
S Metis	glm-4.7	$0.60	$2.20	$0.11
NovitaAI	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
S AvalAI	qwen3-max-2026-01-23	$1.20	$6.00	$0.10
DeepInfra	qwen3-vl-235b-a22b-instruct	$0.20	$0.88	$0.11
S OpenRouter	qwen3-vl-235b-a22b-instruct	$0.21	$1.90	$0.10
NovitaAI	qwen3-vl-235b-a22b-instruct	$0.30	$1.50	—
S AvalAI	qwen3-vl-flash	$0.05	$0.40	$0.01
Alibaba Cloud	qwen3-vl-flash	$0.05	$0.40	$0.01
Alibaba Cloud(cn-beijing)	qwen3-vl-flash	$0.02	$0.21	$0.00
Alibaba Cloud(us-virginia)	qwen3-vl-flash	$0.02	$0.21	$0.00
Alibaba Cloud(singapore)	qwen3-vl-flash	$0.05	$0.40	$0.01

Long Context Models

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

Compare

162

Models

Providers

114

Vision Models

160

Tool-enabled

Free Models


OpenAI	gpt-5.4	$2.50	$15.00	$0.25
Azure	gpt-5.4	$2.50	$15.00	$0.25
S GapGPT	gpt-5.4	$2.50	$15.00	$0.25
S AvalAI	gpt-5.4	$2.50	$15.00	$0.25
S OpenRouter	gpt-5.4	$2.50	$15.00	$0.25
S Metis	gpt-5.4	$2.50	$15.00	$0.25
Azure	o4-mini	$1.10	$4.40	$0.28
S AvalAI	o4-mini	$1.10	$4.40	$0.55
S OpenRouter	o4-mini	$1.10	$4.40	$0.28
OpenAI	o4-mini	$1.10	$4.40	$0.28
AWS Bedrock	claude-opus-4-6	$5.00	$25.00	$0.50
S AvalAI	claude-opus-4-6	$5.00	$25.00	$1.50
AWS Bedrock(eu-west-2)	claude-opus-4-6	$5.50	$27.50	$0.55
S GapGPT	claude-opus-4-6	$5.00	$25.00	$0.50
S OpenRouter	claude-opus-4-6	$5.00	$25.00	$0.50
AWS Bedrock(us)	claude-opus-4-6	$5.50	$27.50	$0.55
AWS Bedrock(eu)	claude-opus-4-6	$5.50	$27.50	$0.55
AWS Bedrock(au)	claude-opus-4-6	$5.50	$27.50	$0.55
AWS Bedrock(global)	claude-opus-4-6	$5.00	$25.00	$0.50
Vertex AI (Anthropic)	claude-opus-4-6	$5.00	$25.00	$0.50
Anthropic	claude-opus-4-6	$5.00	$25.00	$0.50
Z AI	glm-4.6	$0.60	$2.20	$0.11
NovitaAI	glm-4.6	$0.55	$2.20	$0.11
S OpenRouter	glm-4.6	$0.50	$2.00	$0.10
S OpenRouter	glm-4.7-flash	$0.06	$0.40	—
EmberCloud	glm-4.7-flash	$0.06	$0.40	$0.01
Z AI	glm-4.7-flashx	$0.07	$0.40	$0.01
S OpenRouter	glm-4.7	$0.40	$1.75	$0.08
ByteDance	glm-4.7	$0.60	$2.20	$0.11
Cerebras	glm-4.7	$2.25	$2.75	—
Vertex AI (OpenAI-compatible)	glm-4.7	$0.60	$2.20	—
Z AI	glm-4.7	$0.60	$2.20	$0.11
Together AI	glm-4.7	$0.45	$2.00	—
EmberCloud	glm-4.7	$0.38	$1.98	$0.19
S Hormouz	glm-4.7	$0.60	$2.20	$0.11
S Metis	glm-4.7	$0.60	$2.20	$0.11
NovitaAI	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
S AvalAI	qwen3-max-2026-01-23	$1.20	$6.00	$0.10
DeepInfra	qwen3-vl-235b-a22b-instruct	$0.20	$0.88	$0.11
S OpenRouter	qwen3-vl-235b-a22b-instruct	$0.21	$1.90	$0.10
NovitaAI	qwen3-vl-235b-a22b-instruct	$0.30	$1.50	—
S AvalAI	qwen3-vl-flash	$0.05	$0.40	$0.01
Alibaba Cloud	qwen3-vl-flash	$0.05	$0.40	$0.01
Alibaba Cloud(cn-beijing)	qwen3-vl-flash	$0.02	$0.21	$0.00
Alibaba Cloud(us-virginia)	qwen3-vl-flash	$0.02	$0.21	$0.00
Alibaba Cloud(singapore)	qwen3-vl-flash	$0.05	$0.40	$0.01

Long Context Models

Stay ahead of the curve

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?