Claude Fable 5.1 vs GLM 5.3
API pricing, context window and capabilities for Claude Fable 5.1 and GLM 5.3, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude Fable 5.1 wins on Terminal-Bench and on intelligence. GLM 5.3 wins on price.
Price
GLM 5.3
Terminal-Bench
Claude Fable 5.1
Intelligence
Claude Fable 5.1
Context window
Tied
Key takeaways
who wins on what, from the published numbersClaude Fable 5.1 wins
- Has web search
GLM 5.3 wins
- Cheaper input ($10.00 vs $0.079 /1M)
- Cheaper output ($50.00 vs $3.08 /1M)
- Higher max output (128K vs 1M)
- More serving providers (7 vs 16)
Cheaper overall
GLM 5.3
$0.079 + $3.08 /1M
Larger context
Tied
More providers
GLM 5.3
16 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. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day.
| Claude Fable 5.1 | GLM 5.3 | |
|---|---|---|
| Input $/1M | $10.00via Anthropic | $0.079OpenRouter routed quote best |
| Output $/1M | $50.00via Anthropic | $3.08via Sail best |
| Context window | 1M | 1M |
| Max output | 128K | 1M best |
| Serving providers | 7 | 16 best |
| Date | Released Sep 1, 2026 | Released Aug 14, 2026 |
Benchmarks
Benchmark scores, side by side| Claude Fable 5.1 | GLM 5.3 | |
|---|---|---|
| Intelligence | 53.4 best | 44.8 |
| Terminal-Bench | 91% best | 84% |
| GPQA Diamond | 94% best | 92% |
| Output speed | 71 t/s best | 62 t/s |
| Latency (TTFT) | 249.68s | 3.50s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Fable 5.1
via Amazon Bedrock
$100
GLM 5.3
via OpenRouter
$5.20
Capabilities
feature support, side by side| Feature | Claude Fable 5.1 | GLM 5.3 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | — |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Fable 5.1 or GLM 5.3?
GLM 5.3 is cheaper for input ($10.00 vs $0.079 per 1M tokens) as an OpenRouter routed quote. GLM 5.3 is cheaper for output ($50.00 vs $3.08 per 1M tokens) from Sail.
What is the context window difference between Claude Fable 5.1 and GLM 5.3?
Both Claude Fable 5.1 and GLM 5.3 have about a 1M-token context window.
How do Claude Fable 5.1 and GLM 5.3 compare on benchmarks?
On the tracked benchmarks, Claude Fable 5.1 leads on Terminal-Bench, and Claude Fable 5.1 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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