Gemini 3.8 Flash vs Claude Fable 5.1 vs GPT-5.6 Sol: which API should developers use?
Gemini 3.8 Flash vs Claude Fable 5.1 vs GPT-5.6 Sol: Which API Should You Use? Three frontier APIs shipped or changed pricing within a week of one another, landing in three distinct price bands. Google released Gemini 3.8 Flash on September 2, 2026, at $0.75 per million input tokens and $3.75 per million output tokens. Anthropic released Claude Fable 5.1 the day before at $10 and $50. OpenAI’s…
Google, Anthropic, and OpenAI have recently launched or updated their respective API models - Gemini 3.8 Flash, Claude Fable 5.1, and GPT-5.6 Sol. These models have different pricing structures and specifications, with Gemini 3.8 Flash being the most cost-effective at $0.75 per million input tokens and $3.75 per million output tokens.
However, Gemini 3.8 Flash has a lower maximum output token limit of 65,536 compared to Claude Fable 5.1's 128K tokens and GPT-5.6 Sol's 128K tokens. Artificial Analysis has assigned an Intelligence Index score of 59 to Gemini 3.8 Flash, 57 to Claude Fable 5.1, and 59 to GPT-5.6 Sol, based on high and medium effort settings respectively.
Developers should consider the trade-offs between pricing, maximum output token limits, and the specific needs of their workloads when choosing a model for their applications.
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