GPT-5.6 Sol Pro vs Claude Opus 4.8 (Fast): side-by-side summary

GPT-5.6 Sol Pro and Claude Opus 4.8 (Fast) are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-5.6 Sol Pro, from OpenAI, has a 1,050,000-token context window and is priced at $5/M tokens input, $30/M tokens output on OpenRouter.

Claude Opus 4.8 (Fast), from Anthropic, has a 1,000,000-token context window and is priced at $10/M tokens input, $50/M tokens output on OpenRouter.

Context window

• GPT-5.6 Sol Pro: 1,050,000 tokens
• Claude Opus 4.8 (Fast): 1,000,000 tokens

Price

• GPT-5.6 Sol Pro: $5/M tokens input, $30/M tokens output
• Claude Opus 4.8 (Fast): $10/M tokens input, $50/M tokens output

Provided by

• GPT-5.6 Sol Pro: OpenAI
• Claude Opus 4.8 (Fast): Anthropic

• GPT-5.6 Sol Pro model details, providers and pricing
• Claude Opus 4.8 (Fast) model details, providers and pricing