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GPT-5.1-Codex-Mini vs GLM 5.2

Detailed technical comparison between GPT-5.1-Codex-Mini (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-5.1-Codex-Mini: 6 WinsvsGLM 5.2: 0 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

GPT-5.1-Codex-Mini

$0.25 / MTok
OpenAIactive

GPT-5.1-Codex-Mini

GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex

View GPT-5.1-Codex-Mini 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-5.1-Codex-MiniGLM 5.2
ProviderOpenAIZhipu AI
Context Window400,000 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 Date2025-11-132026-06-16

API Pricing Comparison

Input Price per Million Tokens

GPT-5.1-Codex-Mini

$0.25

GLM 5.2

$0.80

Output Price per Million Tokens

GPT-5.1-Codex-Mini

$2.00

GLM 5.2

$2.50

💡 Cost Ratio: GPT-5.1-Codex-Mini is 3.2x cheaper per input token than GLM 5.2.

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
92.4%vs89.5%+2.9% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
GLM 5.2
HumanEvalPython coding & logic synthesis
99.0%vs91.2%+7.8% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
GLM 5.2
MATHComplex mathematical problem solving
80.8%vs80.5%+0.3% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
GLM 5.2
GPQAGraduate-level expert reasoning
59.2%vs53.5%+5.7% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
GLM 5.2
HellaSwagCommonsense reasoning and inference
91.4%vs89.8%+1.6% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
GLM 5.2
MT-BenchMulti-turn conversation flow quality
9.4%vs9.3%+0.1% GPT-5.1-Codex-Mini
GPT-5.1-Codex-Mini 🏆
GLM 5.2

GPT-5.1-Codex-Mini Quirks & Gotchas

No developer gotchas reported.

GLM 5.2 Quirks & Gotchas

No developer gotchas reported.

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