CtrlAltDebrief

GLM 5.2 vs GPT-5.5

API pricing, context window and capabilities for GLM 5.2 and GPT-5.5, side by side. Prices are the cheapest serving route per 1M tokens, verified against LiteLLM and OpenRouter.

Verdict

computed from the published numbers

GLM 5.2 wins on price. GPT-5.5 wins on coding, on intelligence and on context window.

Price
GLM 5.2
Coding
GPT-5.5
Intelligence
GPT-5.5
Context window
GPT-5.5

Key takeaways

who wins on what, from the published numbers

GLM 5.2 wins

  • Cheaper input ($1.40 vs $5.00 /1M)
  • Cheaper output ($4.40 vs $30.00 /1M)
  • Higher max output (262K vs 128K)

GPT-5.5 wins

  • Larger context window (262K vs 1.1M)
  • More serving providers (1 vs 2)
  • Supports vision
  • Supports prompt caching
  • Supports structured output
  • Has web search
Cheaper overall
GLM 5.2
$1.40 + $4.40 /1M
Larger context
GPT-5.5
1.1M
More providers
GPT-5.5
2 providers

Pricing & specs

cheapest serving route · per 1M tokens
GLM 5.2GPT-5.5
Input $/1M$1.40 best$5.00
Output $/1M$4.40 best$30.00
Context window262K 1.1M best
Max output262K best128K
Serving providers1 2 best
Released2026-06-13 2026-04-23

Benchmarks

Artificial Analysis indices, side by side
GLM 5.2GPT-5.5
Intelligence51.1 54.8 best
Coding68.8 74.9 best
GPQA Diamond89% 94% best
Output speed200 t/s best87 t/s
Latency (TTFT)6.32s best23.21s

Cost calculator

choose a serving route for each side
Input tokens / month
Output tokens / month
GLM 5.2
via Cloudflare
$11
GPT-5.5
via Azure
$55

Capabilities

feature support, side by side
FeatureGLM 5.2GPT-5.5
Vision—✓
Tool use✓✓
Reasoning✓✓
Audio——
Prompt caching—✓
Structured output—✓
Web search—✓

Related comparisons

Frequently asked questions

Which is cheaper, GLM 5.2 or GPT-5.5?
GLM 5.2 is cheaper for input ($1.40 vs $5.00 per 1M tokens). GLM 5.2 is cheaper for output ($4.40 vs $30.00 per 1M tokens).
What is the context window difference between GLM 5.2 and GPT-5.5?
GLM 5.2 has a 262K-token context window and GPT-5.5 has 1.1M tokens, so GPT-5.5 can take a larger prompt.
How do GLM 5.2 and GPT-5.5 compare on benchmarks?
On the tracked Artificial Analysis indices, GPT-5.5 leads on coding, and GPT-5.5 leads on intelligence.
Pricing verified against LiteLLM + OpenRouter + provider pages · refreshed daily

Every weekday

AI moves fast. Here's your debrief.

News, analysis, tools, and more.

For people who build with AI