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

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 Instant?

GPT-5.1 Instant is cheaper for input: $0.30 per 1M tokens vs $0.60.

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

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

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

Characteristic	GLM-4.5	GPT-5.1 Instant
Company	Zhipu AI	OpenAI
Release Date	July 27, 2025	November 11, 2025
Parameters	355B	—
Multimodal	No	Yes
Context (input)	131K	256K
Context (output)	98K	32K
Input Price / 1M	$0.60	$0.30
Output Price / 1M	$2.20	$1.20
Average Score	0.8	0.9
Benchmarks
GPQA	0.8	0.9

Visual Benchmark Comparison

GLM-4.5

GPT-5.1 Instant

GPQA0.8 vs 0.9

0.8

0.9

Verdict

GPT-5.1 Instant leads in 3 out of 4 comparison categories.

Overall Performance

Both models show comparable average scores: GLM-4.5 — 0.8, GPT-5.1 Instant — 0.9.

API Cost

GPT-5.1 Instant is 1.9x cheaper: input $0.30/1M vs $0.60/1M tokens.

Context Window

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

Recency

GPT-5.1 Instant 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 Instant

OpenAI — specs, benchmarks, API

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All model comparisons →

The GLM-4.5 and GPT-5.1 Instant 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 Instant page. See also the complete list of AI model comparisons.