CtrlAltDebrief

GLM 5.1 vs Qwen3.5 397B A17B

API pricing, context window and capabilities for GLM 5.1 and Qwen3.5 397B A17B, side by side. Prices are the cheapest serving route per 1M tokens, verified against LiteLLM and OpenRouter.

Verdict

computed from the published numbers

GLM 5.1 wins on coding and on intelligence. Qwen3.5 397B A17B wins on context window.

Price
Tied
Coding
GLM 5.1
Intelligence
GLM 5.1
Context window
Qwen3.5 397B A17B

Key takeaways

who wins on what, from the published numbers

GLM 5.1 wins

  • Cheaper output ($3.50 vs $3.60 /1M)
  • Higher max output (128K vs 66K)
  • Supports prompt caching

Qwen3.5 397B A17B wins

  • Cheaper input ($1.05 vs $0.60 /1M)
  • Larger context window (203K vs 262K)
  • More serving providers (2 vs 3)
  • Supports vision
  • Supports structured output
Cheaper overall
Qwen3.5 397B A17B
$0.60 + $3.60 /1M
Larger context
Qwen3.5 397B A17B
262K
More providers
Qwen3.5 397B A17B
3 providers

Pricing & specs

cheapest serving route · per 1M tokens
GLM 5.1Qwen3.5 397B A17B
Input $/1M$1.05 $0.60 best
Output $/1M$3.50 best$3.60
Context window203K 262K best
Max output128K best66K
Serving providers2 3 best
Released2026-04-07 2026-02-16

Benchmarks

Artificial Analysis indices, side by side
GLM 5.1Qwen3.5 397B A17B
Intelligence40.2 best33.7
Coding55.8 best48.2
GPQA Diamond87% 89% best
Output speed91 t/s best61 t/s
Latency (TTFT)10.49s 9.37s best

Cost calculator

choose a serving route for each side
Input tokens / month
Output tokens / month
GLM 5.1
via OpenRouter
$8.75
Qwen3.5 397B A17B
via OpenRouter
$6.60

Capabilities

feature support, side by side
FeatureGLM 5.1Qwen3.5 397B A17B
Vision—✓
Tool use✓✓
Reasoning✓✓
Audio——
Prompt caching✓—
Structured output—✓
Web search——

Related comparisons

Frequently asked questions

Which is cheaper, GLM 5.1 or Qwen3.5 397B A17B?
Qwen3.5 397B A17B is cheaper for input ($1.05 vs $0.60 per 1M tokens). GLM 5.1 is cheaper for output ($3.50 vs $3.60 per 1M tokens).
What is the context window difference between GLM 5.1 and Qwen3.5 397B A17B?
GLM 5.1 has a 203K-token context window and Qwen3.5 397B A17B has 262K tokens, so Qwen3.5 397B A17B can take a larger prompt.
How do GLM 5.1 and Qwen3.5 397B A17B compare on benchmarks?
On the tracked Artificial Analysis indices, GLM 5.1 leads on coding, and GLM 5.1 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