Best Long Context LLM APIs (200K+ tokens)
Processing entire codebases, long documents, or extended conversations requires LLM APIs with large context windows. Here are the best options in 2026.
Gemini 2.5 Pro
Price: Free (within limits)
Context: 1,048,576
Key: Largest context window, multimodal, free tier available
DeepSeek V4 Pro
DeepSeek
Price: $1.74/$3.48 per M in/out
Context: 1,000,000
Key: 1M context at low cost, strong reasoning
GPT-4.1
OpenAI
Price: $2/$8 per M in/out
Context: 1,047,576
Key: 1M context, excellent for code agents
Kimi K2.6
Moonshot AI
Price: $0.95/$4 per M in/out
Context: 262,144
Key: Large context at competitive pricing
Claude Sonnet 4.6
Anthropic
Price: $3/$15 per M in/out
Context: 200,000
Key: Strong retrieval accuracy, tool use
GPT-5.4
OpenAI
Price: $2.5/$15 per M in/out
Context: 272,000
Key: Latest GPT generation, strong all-around
Prices and availability subject to change. Affiliate disclosure.