Claude Opus 4.7 (Fast) vs Grok 4.3: side-by-side summary

Claude Opus 4.7 (Fast) and Grok 4.3 are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Claude Opus 4.7 (Fast), from Anthropic, has a 1,000,000-token context window and is priced by the provider serving it on OpenRouter.

Grok 4.3, from SpaceXAI, has a 1,000,000-token context window and is priced at $1.25/M tokens input, $2.50/M tokens output on OpenRouter.

Context window

• Claude Opus 4.7 (Fast): 1,000,000 tokens
• Grok 4.3: 1,000,000 tokens

Price

• Claude Opus 4.7 (Fast): Pricing varies by provider
• Grok 4.3: $1.25/M tokens input, $2.50/M tokens output

Provided by

• Claude Opus 4.7 (Fast): Anthropic
• Grok 4.3: SpaceXAI

• Claude Opus 4.7 (Fast) model details, providers and pricing
• Grok 4.3 model details, providers and pricing