AI model API cost comparisons

Side-by-side API costs for the models people compare most: price per million tokens, cost per request for chat, RAG, coding agents and writing, and monthly totals. Prices update automatically (last checked 2026-10-01).

• GPT-6 Sol vs Claude Sonnet 5.5
• GPT-6 Astra vs Claude Opus 5.5
• GPT-6 Astra vs Claude Fable 5.1
• GPT-6 Astra vs Gemini 4 Argon
• Gemini 4 Argon vs Claude Opus 5.5
• Gemini 4 Argon vs Claude Fable 5.1
• Gemini 4 Argon vs Gemini 3.1 Pro
• Gemini 3.1 Pro vs GPT-6 Sol
• Gemini 3.1 Pro vs Claude Sonnet 5.5
• GPT-6 Sol vs GPT-6 Astra
• GPT-6 Luna vs GPT-6 Sol
• GPT-6 Luna vs Gemini 3.8 Flash
• GPT-6 Luna vs Claude Haiku 4.5
• Gemini 3.8 Flash vs Claude Haiku 4.5
• Claude Sonnet 5.5 vs Claude Opus 5.5
• Claude Haiku 4.5 vs Claude Sonnet 5.5
• Claude Opus 5.5 vs Claude Fable 5.1
• DeepSeek V4 Pro vs GPT-6 Sol
• DeepSeek V4 Pro vs Claude Sonnet 5.5
• DeepSeek V4 Flash vs GPT-6 Luna
• Grok 4.7 vs GPT-6 Sol
• Kimi K3 vs Claude Sonnet 5.5
• Qwen 3.8 Max vs GPT-6 Sol
• GPT-5.6 vs GPT-6 Sol

Want the full list in one table? See LLM API pricing compared, or paste your own prompt into the token counter.