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GPT-5.3 Chat vs GLM 5.2

Detailed technical comparison between GPT-5.3 Chat (OpenAI) and GLM 5.2 (Zhipu AI). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.

⚡ Executive Summary & Verdict

Comparison Snapshot

GPT-5.3 Chat: 3 WinsvsGLM 5.2: 3 Wins
Context Leader

GLM 5.2

1,048,576 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

GLM 5.2

$0.80 / MTok
OpenAIactive

GPT-5.3 Chat

GPT-5.3 Chat is an update to ChatGPT's most-used model that makes everyday conversations smoother, more useful, and more directly helpful. It delivers more accurate answers with better contextualization and significantly...

View GPT-5.3 Chat Full Specs →
Zhipu AIactive

GLM 5.2

GLM 5.2 is a large-scale reasoning model from Z.ai. It supports text input and output with a 1M-token context window, and is suited for long-horizon agent workflows, project-level software engineering,...

View GLM 5.2 Full Specs →

Technical Specifications

🏆 = Superior Spec
SpecificationGPT-5.3 ChatGLM 5.2
ProviderOpenAIZhipu AI
Context Window128,000 tokens1,048,576 tokens🏆
Agent SuitabilityN/AN/A
Time to First Token (TTFT)N/AN/A
Deployment Modelmanaged apimanaged api
Production Stabilitystablebeta
API AvailableYesYes
Released Date2026-03-032026-06-16

API Pricing Comparison

Input Price per Million Tokens

GPT-5.3 Chat

$1.75

GLM 5.2

$0.80

Output Price per Million Tokens

GPT-5.3 Chat

$14.00

GLM 5.2

$2.52

💡 Cost Ratio: GLM 5.2 is 2.2x cheaper per input token than GPT-5.3 Chat.

Want to test both models live?

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Benchmark Performance Metrics

Standardized Scores (0–100%)

Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.

MMLUGeneral knowledge & multi-task understanding
90.6%vs89.5%+1.1% GPT-5.3 Chat
GPT-5.3 Chat 🏆
GLM 5.2
HumanEvalPython coding & logic synthesis
91.8%vs91.2%+0.6% GPT-5.3 Chat
GPT-5.3 Chat 🏆
GLM 5.2
MATHComplex mathematical problem solving
79.0%vs80.5%+1.5% GLM 5.2
GPT-5.3 Chat
GLM 5.2 🏆
GPQAGraduate-level expert reasoning
57.4%vs53.5%+3.9% GPT-5.3 Chat
GPT-5.3 Chat 🏆
GLM 5.2
HellaSwagCommonsense reasoning and inference
89.6%vs89.8%+0.2% GLM 5.2
GPT-5.3 Chat
GLM 5.2 🏆
MT-BenchMulti-turn conversation flow quality
9.2%vs9.3%+0.1% GLM 5.2
GPT-5.3 Chat
GLM 5.2 🏆

GPT-5.3 Chat Quirks & Gotchas

No developer gotchas reported.

GLM 5.2 Quirks & Gotchas

No developer gotchas reported.

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