Grok 4.6 vs Fugu Ultra: side-by-side summary

Grok 4.6 and Fugu Ultra are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Grok 4.6, from SpaceXAI, has a 500,000-token context window and is priced at $2/M tokens input, $6/M tokens output on OpenRouter.

Fugu Ultra, from sakana, has a 1,000,000-token context window and is priced at $5/M tokens input, $30/M tokens output on OpenRouter.

Context window

• Grok 4.6: 500,000 tokens
• Fugu Ultra: 1,000,000 tokens

Price

• Grok 4.6: $2/M tokens input, $6/M tokens output
• Fugu Ultra: $5/M tokens input, $30/M tokens output

Provided by

• Grok 4.6: SpaceXAI
• Fugu Ultra: sakana

• Grok 4.6 model details, providers and pricing
• Fugu Ultra model details, providers and pricing