Compare LLM API costs, model vs model

Each comparison shows both models’ prices per million tokens, the monthly cost of common workloads, and a calculator for your own prompt. Prices checked on October 28, 2026.

Across providers

ComparisonPrices (in / out per 1M)Cheaper for a chatbot*
Claude Sonnet 5.5 vs GPT-6.1 Sol$2/$10 vs $2/$10GPT-6.1 Sol
Claude Opus 5.5 vs GPT-6 Astra$4/$20 vs $10/$50Claude Opus 5.5
Claude Haiku 5.5 vs GPT-6 Luna$0.1/$0.5 vs $0.1/$0.5GPT-6 Luna
Claude Sonnet 5.5 vs Gemini 4 Argon$2/$10 vs $2/$10Gemini 4 Argon
GPT-6.1 Sol vs Gemini 4 Argon$2/$10 vs $2/$10GPT-6.1 Sol
Claude Opus 5.5 vs Gemini 4 Argon$4/$20 vs $2/$10Gemini 4 Argon
Claude Haiku 5.5 vs Gemini 3.8 Flash$0.1/$0.5 vs $0.75/$3.75Claude Haiku 5.5
GPT-6.1 Terra vs Gemini 3.8 Flash$1/$5 vs $0.75/$3.75Gemini 3.8 Flash
GPT-6 Luna vs Gemini 2.5 Flash-Lite$0.1/$0.5 vs $0.1/$0.4Gemini 2.5 Flash-Lite
Claude Sonnet 5.5 vs Grok 4.7$2/$10 vs $2/$6Grok 4.7
GPT-6.1 Sol vs Grok 4.7$2/$10 vs $2/$6Grok 4.7
Gemini 4 Argon vs Grok 4.7$2/$10 vs $2/$6Grok 4.7
Claude Sonnet 5.5 vs DeepSeek V4 Pro$2/$10 vs $1.32/$3.96DeepSeek V4 Pro
GPT-6.1 Sol vs DeepSeek V4 Pro$2/$10 vs $1.32/$3.96DeepSeek V4 Pro
Claude Haiku 5.5 vs DeepSeek Flash$0.1/$0.5 vs $0.3/$1.2Claude Haiku 5.5
Gemini 3.8 Flash vs DeepSeek Flash$0.75/$3.75 vs $0.3/$1.2DeepSeek Flash
DeepSeek V4 Pro vs Mistral Large 3$1.32/$3.96 vs $0.5/$1.5Mistral Large 3

Within the same provider

ComparisonPrices (in / out per 1M)Cheaper for a chatbot*
Claude Opus 5.5 vs Claude Sonnet 5.5$4/$20 vs $2/$10Claude Sonnet 5.5
Claude Fable 5.1 vs Claude Opus 5.5$10/$50 vs $4/$20Claude Opus 5.5
Claude Opus 5.5 vs Claude Opus 5$4/$20 vs $5/$25Claude Opus 5.5
Claude Sonnet 5.5 vs Claude Sonnet 4.6$2/$10 vs $3/$15Claude Sonnet 5.5
Claude Haiku 5.5 vs Claude Haiku 4.5$0.1/$0.5 vs $1/$5Claude Haiku 5.5
GPT-6 Astra vs GPT-6.1 Sol$10/$50 vs $2/$10GPT-6.1 Sol
GPT-6.1 Sol vs GPT-6 Sol$2/$10 vs $2/$10About the same
GPT-5.6 Sol vs GPT-6.1 Sol$4/$20 vs $2/$10GPT-6.1 Sol
Gemini 4 Argon vs Gemini 3.1 Pro (preview)$2/$10 vs $2/$12Gemini 4 Argon
Gemini 3.8 Flash vs Gemini 2.5 Flash$0.75/$3.75 vs $0.3/$2.5Gemini 2.5 Flash
Grok 4.7 vs Grok 4.3$2/$6 vs $1.25/$2.5Grok 4.3

* 1,500 input + 400 output tokens, 100,000 requests a month. Token counts are converted per model, since each provider counts the same text differently.