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  1. Home
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  3. Compare

DeepSeek V3.1 Terminus vs GPT-5.1-Codex

Compare DeepSeek V3.1 Terminus from DeepSeek and GPT-5.1-Codex from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the OpenRouter API.

Favicon for deepseek
DeepSeek V3.1 Terminus
Favicon for openai
GPT-5.1-Codex
Favicon for deepseek
DeepSeek V3.1 Terminus
Favicon for openai
GPT-5.1-Codex

Overview

DeepSeek V3.1 Terminus
Author
DeepSeek
GPT-5.1-Codex
Author
OpenAI
DeepSeek V3.1 Terminus
Context length
164Ktokens
GPT-5.1-Codex
Context length
400Ktokens
DeepSeek V3.1 Terminus
Reasoning
GPT-5.1-Codex
Reasoning
DeepSeek V3.1 Terminus
Input modalities
GPT-5.1-Codex
Input modalities
DeepSeek V3.1 Terminus
Output modalities
GPT-5.1-Codex
Output modalities

DeepSeek V3.1 Terminus vs GPT-5.1-Codex: side-by-side summary

DeepSeek V3.1 Terminus and GPT-5.1-Codex 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.

GPT-5.1-Codex, from OpenAI, has a 400,000-token context window and is priced at $1.25/M tokens input, $10/M tokens output on OpenRouter.

Context window
  • DeepSeek V3.1 Terminus: 163,840 tokens
  • GPT-5.1-Codex: 400,000 tokens
Price
  • DeepSeek V3.1 Terminus: $0.27/M tokens input, $1/M tokens output
  • GPT-5.1-Codex: $1.25/M tokens input, $10/M tokens output
Provided by
  • DeepSeek V3.1 Terminus: DeepSeek
  • GPT-5.1-Codex: OpenAI
  • model details, providers and pricing
DeepSeek V3.1 Terminus
model details, providers and pricing
GPT-5.1-Codex