Claude Opus 4.8 vs GLM 5.1
API pricing, context window and capabilities for Claude Opus 4.8 and GLM 5.1, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude Opus 4.8 wins on Terminal-Bench, on intelligence and on context window. GLM 5.1 wins on price.
Price
GLM 5.1
Terminal-Bench
Claude Opus 4.8
Intelligence
Claude Opus 4.8
Context window
Claude Opus 4.8
Key takeaways
who wins on what, from the published numbersClaude Opus 4.8 wins
- Larger context window (1M vs 205K)
- Supports vision
- Has web search
GLM 5.1 wins
- Cheaper input ($5.00 vs $1.05 /1M)
- Cheaper output ($25.00 vs $3.50 /1M)
- Higher max output (128K vs 203K)
- More serving providers (8 vs 12)
Cheaper overall
GLM 5.1
$1.05 + $3.50 /1M
Larger context
Claude Opus 4.8
1M
More providers
GLM 5.1
12 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| Claude Opus 4.8 | GLM 5.1 | |
|---|---|---|
| Input $/1M | $5.00via Anthropic | $1.05via DeepInfra best |
| Output $/1M | $25.00via Anthropic | $3.50via DeepInfra best |
| Context window | 1M best | 205K |
| Max output | 128K | 203K best |
| Serving providers | 8 | 12 best |
| Date | Released May 28, 2026 | Released Apr 7, 2026 |
Benchmarks
Benchmark scores, side by side| Claude Opus 4.8 | GLM 5.1 | |
|---|---|---|
| Intelligence | 41.8 best | 26.1 |
| Terminal-Bench | 85% best | 62% |
| GPQA Diamond | 92% best | 87% |
| Output speed | 62 t/s | 66 t/s best |
| Latency (TTFT) | 56.16s | 1.71s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Opus 4.8
via Azure
$50
GLM 5.1
via DeepInfra
$8.75
Capabilities
feature support, side by side| Feature | Claude Opus 4.8 | GLM 5.1 |
|---|---|---|
| Vision | ✓ | — |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | — |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Opus 4.8 or GLM 5.1?
GLM 5.1 is cheaper for input ($5.00 vs $1.05 per 1M tokens) from DeepInfra. GLM 5.1 is cheaper for output ($25.00 vs $3.50 per 1M tokens) from DeepInfra.
What is the context window difference between Claude Opus 4.8 and GLM 5.1?
Claude Opus 4.8 has a 1M-token context window and GLM 5.1 has 205K tokens, so Claude Opus 4.8 can take a larger prompt.
How do Claude Opus 4.8 and GLM 5.1 compare on benchmarks?
On the tracked benchmarks, Claude Opus 4.8 leads on Terminal-Bench, and Claude Opus 4.8 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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