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  1. Home
  2. /
  3. Compare

GLM 5.3 vs GLM 5.3 Flash

Compare GLM 5.3 from Z.ai and GLM 5.3 Flash from Z.ai 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 z-ai
GLM 5.3
Favicon for z-ai
GLM 5.3 Flash
Favicon for z-ai
GLM 5.3
Favicon for z-ai
GLM 5.3 Flash

Overview

GLM 5.3
Author
Z.ai
GLM 5.3 Flash
Author
Z.ai
GLM 5.3
Context length
1.05Mtokens
GLM 5.3 Flash
Context length
1.05Mtokens
GLM 5.3
Reasoning
GLM 5.3 Flash
Reasoning
GLM 5.3
Input modalities
GLM 5.3 Flash
Input modalities
GLM 5.3
Output modalities
GLM 5.3 Flash
Output modalities

GLM 5.3 vs GLM 5.3 Flash: side-by-side summary

GLM 5.3 and GLM 5.3 Flash are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GLM 5.3, from Z.ai, has a 1,048,576-token context window and is priced at $0.079/M tokens input, $4.80/M tokens output on OpenRouter.

GLM 5.3 Flash, from Z.ai, has a 1,048,576-token context window and is priced at $0.0261/M tokens input, $0.90/M tokens output on OpenRouter.

Context window
  • GLM 5.3: 1,048,576 tokens
  • GLM 5.3 Flash: 1,048,576 tokens
Price
  • GLM 5.3: $0.079/M tokens input, $4.80/M tokens output
  • GLM 5.3 Flash: $0.0261/M tokens input, $0.90/M tokens output
Provided by
  • GLM 5.3: Z.ai
  • GLM 5.3 Flash: Z.ai
  • GLM 5.3 model details, providers and pricing
  • GLM 5.3 Flash model details, providers and pricing

GLM 5.3 vs GLM 5.3 Flash at a glance

GLM 5.3 vs GLM 5.3 Flash comparison
AttributeGLM 5.3GLM 5.3 Flash
Input price$0.079/M tokens$0.0261/M tokens
Output price$4.80/M tokens$0.90/M tokens
Context window1,048,576 tokens1,048,576 tokens
Intelligence Index44.841.8
Coding Index74.871.5
Agentic Index53.150.9
Latency (p50)0.93 s4.85 s
Throughput (p50)73.0 tok/s17.0 tok/s

Benchmark data updated Oct 8, 2026

Frequently asked questions

Is GLM 5.3 cheaper than GLM 5.3 Flash?

GLM 5.3 Flash is cheaper than GLM 5.3 on OpenRouter: GLM 5.3 Flash costs $0.0261/M tokens input and $0.90/M tokens output, while GLM 5.3 costs $0.079/M tokens input and $4.80/M tokens output.

Which has the longer context window, GLM 5.3 or GLM 5.3 Flash?

GLM 5.3 and GLM 5.3 Flash have the same context window of 1,048,576 tokens.

Which is faster, GLM 5.3 or GLM 5.3 Flash?

GLM 5.3 is faster on OpenRouter, generating a median 73.0 tokens per second compared with 17.0 tokens per second for GLM 5.3 Flash.

Which scores higher on coding, GLM 5.3 or GLM 5.3 Flash?

GLM 5.3 scores higher on coding, with an Artificial Analysis Coding Index of 74.8 compared with 71.5 for GLM 5.3 Flash.