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GPT 5.3 Codex vs Kimi K2.7 Code

At a glance
OpenAIGPT 5.3 Codex

OpenAI's most advanced agentic coding model with 400K context.

87400K ctx$1.75/$14.00 per M#8/92
MoonshotAIKimi K2.7 Code

MoonshotAI's coding-focused Kimi model for end-to-end software engineering.

82262K ctx$0.74/$3.50 per M#20/92
AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
OpenAIGPT 5.3 Codex
Reasoning
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter
Capability
CapabilityECI87.0
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Coding
Real-World Coding74.8%
Agentic
Terminal Tasks78.4%Task Horizon5.8h
MoonshotAIKimi K2.7 Code
Reasoning
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Cheaper
Capability
CapabilityECI81.8
Reasoning & Knowledge
Graduate Science89.5%Factual Recall39.2%
Math
Competition Math96.4%
Coding
Real-World Coding—
Agentic
Terminal Tasks—Task Horizon—
Specs
OpenAIGPT 5.3 Codex
400K
Context
128K
Max output
Feb 2026
Released
MoonshotAIKimi K2.7 Code
262K
Context
16K
Max output
Jun 2026
Released
Capabilities
OpenAIGPT 5.3 Codex
Vision
Audio
Reasoning
MoonshotAIKimi K2.7 Code
Vision
Audio
Reasoning
Pricing
OpenAIGPT 5.3 Codex
Live pricing, shown before you run
Input$1.75/M tokens
Output$14.00/M tokens
Cache read$0.17/M tokens
Web search$0.01/search
MoonshotAIKimi K2.7 Code
Live pricing, shown before you run
Input$0.74/M tokens
Output$3.50/M tokens
Cache read$0.15/M tokens
Chat with GPT 5.3 CodexGo to model
Chat with Kimi K2.7 CodeGo to model
Frequently Asked Questions: GPT 5.3 Codex vs Kimi K2.7 Code▼

Which is better, GPT 5.3 Codex or Kimi K2.7 Code?

▼

Based on the Capability Index, GPT 5.3 Codex scores higher (87.0 vs 81.8). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which is cheaper, GPT 5.3 Codex or Kimi K2.7 Code?

▼

Kimi K2.7 Code has a lower blended cost. GPT 5.3 Codex: $1.75 input / $14.00 output. Kimi K2.7 Code: $0.74 input / $3.50 output.

Which has a larger context window, GPT 5.3 Codex or Kimi K2.7 Code?

▼

GPT 5.3 Codex has a larger context window: GPT 5.3 Codex supports 400K tokens vs Kimi K2.7 Code at 262K tokens.

Do both GPT 5.3 Codex and Kimi K2.7 Code support vision?

▼

Yes, both GPT 5.3 Codex and Kimi K2.7 Code support vision/image input.

What are the key differences between GPT 5.3 Codex and Kimi K2.7 Code?

▼

Key differences: GPT 5.3 Codex has a notably higher capability index (5.2 point gap); Kimi K2.7 Code 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 5.3 Codex and Kimi K2.7 Code for free on idapt.app to see which performs better for your specific needs.

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