Skip to main content
idapt
HomeCodeAI ModelsPricing
Sign inStart free
  • Home
  • Pricing
  • AI Models
  • Image models
  • Voice models
  • Video models
  • Rankings
  • New models
  • Model status
  • Multi-Model Chat
  • Voice Mode
  • Voice HUD
  • Web Search
  • Image Generation
  • Video Generation
  • Audio Generation
  • Transcription
  • Drive
  • Credentials
  • Sharing
  • Workspaces
  • Tasks
  • Memory
  • Agents
  • Subagents
  • Automations
  • Skills
  • idapt Code
  • Code Execution
  • Computers
  • Computer Use
  • Computer Assist · Soon
  • Containers · Soon
  • Cloud Computers
  • Local AI
  • AI Gateway
  • API & SDK
  • CLI
  • MCP
  • Tunnels
  • All features →
  • LLM cost calculator
  • Token counter
  • Context window checker
  • Can I run it
  • Model picker quiz
  • Savings finder
  • Video cost estimator
  • Text to speech cost
  • Transcription cost
  • API endpoint tester
  • All free tools →
  • Blog
  • Use cases
  • Comparisons
  • Best of
  • Skills
  • Learn
  • Changelog
  • Help center
  • FAQ
  • Privacy
  • Compare all models
  • Support
  • idapt Code
  • Developers
  • Quickstarts
  • API reference
  • API pricing
  • CLI
  • MCP
  • Downloads
  • Desktop
  • Badges and embeds
© idapt[email protected]TermsPrivacy PolicyLegal noticeReport content
X (Twitter)

GPT 5.1 Codex vs Kimi K3

At a glance

Previous-generation coding-optimized model for software engineering.

400K ctx$1.25/$10.00 per M

MoonshotAI's 2.8T-parameter flagship for complex coding, knowledge work, and long-horizon agent runs.

1.0M ctx$3.00/$15.00 per M
Agent Demos
All agent demos

No shared agent demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
No benchmarks available

This model hasn't been benchmarked yet.

Reasoning
CodingInsufficient data
MathInsufficient data
Sources:Provider·OpenRouter· as of 2026-07-16
Reasoning & Knowledge
Graduate Science93.5%Expert-Level43.5%
Agentic
Terminal Tasks88.3%
Specs
400K
Context
128K
Max output
Nov 2025
Released
1.0M
Context
16K
Max output
Jul 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input58%$1.25/M tokens
Output33%$10.00/M tokens
Cache read58%$0.13/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$3.00/M tokens
Output$15.00/M tokens
Cache read$0.30/M tokens
Chat with GPT 5.1 CodexGo to model
Chat with Kimi K3Go to model
Frequently Asked Questions: GPT 5.1 Codex vs Kimi K3▼

Which is better, GPT 5.1 Codex or Kimi K3?

▼

Both GPT 5.1 Codex and Kimi K3 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 5.1 Codex or Kimi K3?

▼

GPT 5.1 Codex has a lower blended cost. GPT 5.1 Codex: $1.25 input / $10.00 output. Kimi K3: $3.00 input / $15.00 output.

Which has a larger context window, GPT 5.1 Codex or Kimi K3?

▼

Kimi K3 has a larger context window: GPT 5.1 Codex supports 400K tokens vs Kimi K3 at 1M tokens.

Do both GPT 5.1 Codex and Kimi K3 support vision?

▼

Yes, both GPT 5.1 Codex and Kimi K3 support vision/image input.

What are the key differences between GPT 5.1 Codex and Kimi K3?

▼

Key differences: GPT 5.1 Codex is significantly cheaper. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 5.1 Codex and Kimi K3 for free on idapt.app to see which performs better for your specific needs.

Open in App