Model comparison

GPT-5 Codex vs GLM 5.3 GLB

Compare GPT-5 Codex (OpenAI) and GLM 5.3 GLB (Z Ai) by price, context, capabilities, and latency.

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Which should you pick?

  • Price: GLM 5.3 GLB is cheaper ($1.40 / 1M tokens input / $4.40 / 1M tokens output) vs GPT-5 Codex ($1.25 / 1M tokens input / $10 / 1M tokens output).
  • Context: GLM 5.3 GLB has the larger context window (1M tokens).

Side by side

GPT-5 Codex vs GLM 5.3 GLB — full comparison

Compare price, provider, context, capabilities, latency, and source basis.

ModelProviderInputOutputContextCapabilitiesBest forLatencyStatusSource
GPT-5 Codexopenai/gpt-5-codexOpenAI$1.25 / 1M tokens$10 / 1M tokens400k
Streaming
General chat via OpenAI, API workloads1780-3306msCatalogPlatform curated
GLM 5.3 GLBz-ai/glm-5.3-glbZ Ai$1.40 / 1M tokens$4.40 / 1M tokens1M
Streaming
General chat via Z Ai, API workloads1930-8682msCatalogPlatform curated

FAQ

GPT-5 Codex vs GLM 5.3 GLB FAQ

Is GPT-5 Codex or GLM 5.3 GLB cheaper?

GLM 5.3 GLB is cheaper ($1.40 / 1M tokens input / $4.40 / 1M tokens output) vs GPT-5 Codex ($1.25 / 1M tokens input / $10 / 1M tokens output). Actual cost depends on your input/output token mix — estimate it with the pricing calculator.

Which has a larger context window, GPT-5 Codex or GLM 5.3 GLB?

GLM 5.3 GLB is larger (1M tokens) vs 400k tokens.

GPT-5 Codex vs GLM 5.3 GLB for High quality: which should I pick?

Both target High quality. Pick GLM 5.3 GLB to optimize cost, or GLM 5.3 GLB for the longer context window. Test both on real prompts before committing production traffic.

GPT-5 Codex detailsGLM 5.3 GLB detailsPricing calculatorOpenAI-compatible quickstart