Claude Sonnet 5 vs GLM 5.1
API pricing, context window and capabilities for Claude Sonnet 5 and GLM 5.1, side by side. Prices are the cheapest serving route per 1M tokens, verified against LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude Sonnet 5 wins on coding, on intelligence and on context window. GLM 5.1 wins on price.
Price
GLM 5.1
Coding
Claude Sonnet 5
Intelligence
Claude Sonnet 5
Context window
Claude Sonnet 5
Key takeaways
who wins on what, from the published numbersClaude Sonnet 5 wins
- Larger context window (1M vs 203K)
- More serving providers (4 vs 2)
- Supports vision
- Supports structured output
GLM 5.1 wins
- Cheaper input ($2.00 vs $1.05 /1M)
- Cheaper output ($10.00 vs $3.50 /1M)
Cheaper overall
GLM 5.1
$1.05 + $3.50 /1M
Larger context
Claude Sonnet 5
1M
More providers
Claude Sonnet 5
4 providers
Pricing & specs
cheapest serving route · per 1M tokens| Claude Sonnet 5 | GLM 5.1 | |
|---|---|---|
| Input $/1M | $2.00 | $1.05 best |
| Output $/1M | $10.00 | $3.50 best |
| Context window | 1M best | 203K |
| Max output | 128K | 128K |
| Serving providers | 4 best | 2 |
| Released | 2026-06-30 | 2026-04-07 |
Benchmarks
Artificial Analysis indices, side by side| Claude Sonnet 5 | GLM 5.1 | |
|---|---|---|
| Intelligence | 53.4 best | 40.2 |
| Coding | 71.5 best | 55.8 |
| GPQA Diamond | 91% best | 87% |
| Output speed | 67 t/s | 91 t/s best |
| Latency (TTFT) | 42.19s | 10.49s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Sonnet 5
via Amazon Bedrock
$20
GLM 5.1
via OpenRouter
$8.75
Capabilities
feature support, side by side| Feature | Claude Sonnet 5 | GLM 5.1 |
|---|---|---|
| Vision | ✓ | — |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | — |
| Web search | — | — |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Sonnet 5 or GLM 5.1?
GLM 5.1 is cheaper for input ($2.00 vs $1.05 per 1M tokens). GLM 5.1 is cheaper for output ($10.00 vs $3.50 per 1M tokens).
What is the context window difference between Claude Sonnet 5 and GLM 5.1?
Claude Sonnet 5 has a 1M-token context window and GLM 5.1 has 203K tokens, so Claude Sonnet 5 can take a larger prompt.
How do Claude Sonnet 5 and GLM 5.1 compare on benchmarks?
On the tracked Artificial Analysis indices, Claude Sonnet 5 leads on coding, and Claude Sonnet 5 leads on intelligence.
Pricing verified against LiteLLM + OpenRouter + provider pages · refreshed daily
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