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OpenAI
OpenAI
vs
Z
Z-ai

GPT-5.3 Codex vs GLM-5 FP4

A detailed comparison of pricing, benchmarks, and capabilities

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Key Takeaways

GPT-5.3 Codex wins:

  • Larger context window
  • Faster response time
  • Higher intelligence benchmark
  • Better at coding
  • Supports vision
  • Has reasoning mode
  • Supports tool calls

GLM-5 FP4 wins:

  • Cheaper input tokens
  • Cheaper output tokens
Price Advantage
GLM-5 FP4
Benchmark Advantage
GPT-5.3 Codex
Context Window
GPT-5.3 Codex
Speed
GPT-5.3 Codex

Pricing Comparison

Benchmark Comparison

Context & Performance

Capabilities

Feature Comparison

FeatureGPT-5.3 CodexGLM-5 FP4
Vision (Image Input)
Tool/Function Calls
Reasoning Mode
Audio Input
Audio Output
PDF Input
Prompt Caching
Web Search

License & Release

PropertyGPT-5.3 CodexGLM-5 FP4
LicenseProprietaryProprietary
AuthorOpenAIZ-ai
ReleasedFeb 2026Unknown

GPT-5.3 Codex Modalities

Input
textimage
Output
text

GLM-5 FP4 Modalities

Input
Output

Related Comparisons

Compare GPT-5.3 Codex with:

Compare GLM-5 FP4 with:

See all model comparisons

Frequently Asked Questions

GLM-5 FP4 has cheaper input pricing at $0.00/M tokens. GLM-5 FP4 has cheaper output pricing at $0.00/M tokens.
GPT-5.3 Codex scores higher on coding benchmarks with a score of 53.1, compared to GLM-5 FP4's score of N/A.
GPT-5.3 Codex has a 400,000 token context window, while GLM-5 FP4 has a unknown token context window.
GPT-5.3 Codex supports vision. GLM-5 FP4 does not support vision.

Built by @aellman

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