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GPT-5.6 Terra Pro vs GLM 5.2

Detailed technical comparison between GPT-5.6 Terra Pro (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-5.6 Terra Pro: 3 WinsvsGLM 5.2: 2 Wins
Context Leader

GPT-5.6 Terra Pro

1,050,000 tokens
Agentic Tool-Calling

Tie

Equal Capability
Lowest Latency (TTFT)

Tie

Equal Speed
Input Price Leader

GLM 5.2

$0.80 / MTok
OpenAIactive

GPT-5.6 Terra Pro

GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://developers.openai.com/api/docs/guides/reasoning#reasoning-mode

View GPT-5.6 Terra Pro 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-5.6 Terra ProGLM 5.2
ProviderOpenAIZhipu AI
Context Window1,050,000 tokens🏆1,048,576 tokens
Agent SuitabilityN/AN/A
Time to First Token (TTFT)N/AN/A
Deployment Modelmanaged apimanaged api
Production Stabilitybetabeta
API AvailableYesYes
Released Date2026-07-092026-06-16

API Pricing Comparison

Input Price per Million Tokens

GPT-5.6 Terra Pro

$2.50

GLM 5.2

$0.80

Output Price per Million Tokens

GPT-5.6 Terra Pro

$15.00

GLM 5.2

$2.50

💡 Cost Ratio: GLM 5.2 is 3.1x cheaper per input token than GPT-5.6 Terra Pro.

Want to test both models live?

Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.

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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
90.8%vs89.5%+1.3% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
GLM 5.2
HumanEvalPython coding & logic synthesis
92.0%vs91.2%+0.8% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
GLM 5.2
MATHComplex mathematical problem solving
79.2%vs80.5%+1.3% GLM 5.2
GPT-5.6 Terra Pro
GLM 5.2 🏆
GPQAGraduate-level expert reasoning
57.6%vs53.5%+4.1% GPT-5.6 Terra Pro
GPT-5.6 Terra Pro 🏆
GLM 5.2
HellaSwagCommonsense reasoning and inference
89.8%vs89.8%+0.0% GLM 5.2
GPT-5.6 Terra Pro
GLM 5.2
MT-BenchMulti-turn conversation flow quality
9.2%vs9.3%+0.1% GLM 5.2
GPT-5.6 Terra Pro
GLM 5.2 🏆

GPT-5.6 Terra Pro Quirks & Gotchas

No developer gotchas reported.

GLM 5.2 Quirks & Gotchas

No developer gotchas reported.

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