claude-fable-5.1 vs claude-sonnet-4-5
Side-by-side comparison of claude-fable-5.1 and claude-sonnet-4-5: benchmarks, pricing, context window and capabilities. Both are accessible through Requesty's unified API. claude-fable-5.1 outperforms claude-sonnet-4-5 on 5 of 5 shared benchmarks.
claude-fable-5.1
Input / 1M
$10.00
Output / 1M
$50.00
Context
1M
Model ID
anthropic/claude-fable-5.1
claude-sonnet-4-5
Input / 1M
$3.00
Output / 1M
$15.00
Context
1M
Model ID
anthropic/claude-sonnet-4-5
Benchmark comparison
Intelligence Indexreasoning
claude-fable-5.156.8%
claude-sonnet-4-527.3%
Coding Indexcoding
claude-fable-5.181.6%
claude-sonnet-4-552.1%
Math Indexmath
claude-fable-5.1N/A
claude-sonnet-4-588.0%
GPQA Diamondreasoning
claude-fable-5.193.7%
claude-sonnet-4-583.4%
AIME 2025math
claude-fable-5.1N/A
claude-sonnet-4-588.0%
LiveCodeBenchcoding
claude-fable-5.1N/A
claude-sonnet-4-571.4%
Terminal-Bench Hardagentic
claude-fable-5.1N/A
claude-sonnet-4-535.6%
τ²-Benchagentic
claude-fable-5.1N/A
claude-sonnet-4-578.1%
SciCodecoding
claude-fable-5.163.1%
claude-sonnet-4-545.7%
MMLU Proknowledge
claude-fable-5.1N/A
claude-sonnet-4-587.5%
Humanity's Last Examreasoning
claude-fable-5.159.1%
claude-sonnet-4-517.8%
Scores sourced from official model cards, Artificial Analysis, and public leaderboards. Benchmarks measure specific skills and don't capture every aspect of model quality.
Pricing & specifications
| claude-fable-5.1 | claude-sonnet-4-5 | |
|---|---|---|
| Input price / 1M | $10.00 | $3.00 |
| Output price / 1M | $50.00 | $15.00 |
| Context window | 1M tokens | 1M tokens |
| Max output | 128K tokens | 64K tokens |
| Vision input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Prompt caching | Yes | Yes |
| Computer use | Yes | Yes |
| Provider | Anthropic PBC | Anthropic PBC |
Questions people ask
Is claude-fable-5.1 better than claude-sonnet-4-5?
claude-fable-5.1 outperforms claude-sonnet-4-5 on 5 of 5 shared benchmarks. See the benchmark comparison above for specifics: claude-fable-5.1 and claude-sonnet-4-5 have different strengths across reasoning, coding, math and multimodal tasks.
Which is cheaper, claude-fable-5.1 or claude-sonnet-4-5?
claude-sonnet-4-5 is cheaper. claude-fable-5.1 costs $10.00/$50.00 per 1M input/output tokens, while claude-sonnet-4-5 costs $3.00/$15.00.
Can I use claude-fable-5.1 and claude-sonnet-4-5 through the same API?
Yes. Requesty provides a single OpenAI-compatible API that routes to both. Change just the "model" parameter to switch between "anthropic/claude-fable-5.1" and "anthropic/claude-sonnet-4-5", no other code changes needed.
What are the context windows?
claude-fable-5.1 supports up to 1M tokens of context. claude-sonnet-4-5 supports up to 1M tokens. Longer context means you can feed larger documents or codebases in a single prompt, though quality often degrades past 128K for most models.
Switch between claude-fable-5.1 and claude-sonnet-4-5 with one line of code
Requesty provides a single OpenAI-compatible API for 600+ models. Change the model parameter, not your code.