DeepSeek V3.1 Terminus vs Grok 4.1 Fast: side-by-side summary

DeepSeek V3.1 Terminus and Grok 4.1 Fast are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

DeepSeek V3.1 Terminus, from DeepSeek, has a 163,840-token context window and is priced at $0.27/M tokens input, $1/M tokens output on OpenRouter.

Grok 4.1 Fast, from SpaceXAI, has a 2,000,000-token context window and is priced by the provider serving it on OpenRouter.

Context window

• DeepSeek V3.1 Terminus: 163,840 tokens
• Grok 4.1 Fast: 2,000,000 tokens

Price

• DeepSeek V3.1 Terminus: $0.27/M tokens input, $1/M tokens output
• Grok 4.1 Fast: Pricing varies by provider

Provided by

• DeepSeek V3.1 Terminus: DeepSeek
• Grok 4.1 Fast: SpaceXAI

• DeepSeek V3.1 Terminus model details, providers and pricing
• Grok 4.1 Fast model details, providers and pricing