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 ($0.61 vs $5.00 /1M)
  • Cheaper output ($1.98 vs $30.00 /1M)
  • Higher max output (1M vs 128K)
  • More serving providers (10 vs 3)

GPT-5.5 wins

  • Larger context window (1M vs 1.1M)
  • Supports vision
  • Has web search
Cheaper overall
GLM 5.2
$0.61 + $1.98 /1M
Larger context
GPT-5.5
1.1M
More providers
GLM 5.2
10 providers

Pricing & specs

cheapest serving route · per 1M tokens
GLM 5.2GPT-5.5
Input $/1M$0.61 best$5.00
Output $/1M$1.98 best$30.00
Context window1M 1.1M best
Max output1M best128K
Serving providers10 best3
Released2026-06-13 2026-04-23

Benchmarks

Artificial Analysis indices, side by side
GLM 5.2GPT-5.5
Intelligence52.6 56.3 best
Coding68.8 74.9 best
GPQA Diamond89% 94% best
Output speed70 t/s 81 t/s best
Latency (TTFT)1.56s best80.38s

Cost calculator

choose a serving route for each side
Input tokens / month
Output tokens / month
GLM 5.2
via Scx AI
$5.03
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 ($0.61 vs $5.00 per 1M tokens). GLM 5.2 is cheaper for output ($1.98 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 1M-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

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