Which is better for coding — GLM-4.5 or GPT-5.1 Medium?

Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.

Which model is cheaper — GLM-4.5 or GPT-5.1 Medium?

GLM-4.5 is cheaper for input: $0.60 per 1M tokens vs $1.00.

Which has a larger context window — GLM-4.5 or GPT-5.1 Medium?

GPT-5.1 Medium supports a larger context: 256,000 tokens vs 131,072.

GLM-4.5 vs GPT-5.1 Medium: Specs & Benchmark Comparison

Characteristic	GLM-4.5	GPT-5.1 Medium
Company	Zhipu AI	OpenAI
Release Date	July 27, 2025	November 11, 2025
Parameters	355B	—
Multimodal	No	Yes
Context (input)	131K	256K
Context (output)	98K	64K
Input Price / 1M	$0.60	$1.00
Output Price / 1M	$2.20	$4.00
Average Score	0.8	1.0

Verdict

GPT-5.1 Medium leads in 2 out of 4 comparison categories.

Overall Performance

Both models show comparable average scores: GLM-4.5 — 0.8, GPT-5.1 Medium — 1.0.

API Cost

GLM-4.5 is 1.8x cheaper: input $0.60/1M vs $1.00/1M tokens.

Context Window

GPT-5.1 Medium supports a larger context: 256K vs 131K tokens.

Recency

GPT-5.1 Medium is newer: released 11/11/2025 vs 7/27/2025.

More About These Models

GLM-4.5

Zhipu AI — specs, benchmarks, API

GPT-5.1 Medium

OpenAI — specs, benchmarks, API

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The GLM-4.5 and GPT-5.1 Medium comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GLM-4.5 or GPT-5.1 Medium page. See also the complete list of AI model comparisons.