claude-fable-5.1 vs gpt-5.6-luna
Side-by-side comparison of claude-fable-5.1 and gpt-5.6-luna: benchmarks, pricing, context window and capabilities. Both are accessible through Requesty's unified API. claude-fable-5.1 outperforms gpt-5.6-luna 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
gpt-5.6-luna
Input / 1M
$0.20
Output / 1M
$1.20
Context
1.1M
Model ID
openai/gpt-5.6-luna
Benchmark comparison
Intelligence Indexreasoning
claude-fable-5.156.8%
gpt-5.6-luna43.4%
Coding Indexcoding
claude-fable-5.181.6%
gpt-5.6-luna71.4%
GPQA Diamondreasoning
claude-fable-5.193.7%
gpt-5.6-luna91.1%
SciCodecoding
claude-fable-5.163.1%
gpt-5.6-luna53.6%
Humanity's Last Examreasoning
claude-fable-5.159.1%
gpt-5.6-luna39.5%
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 | gpt-5.6-luna | |
|---|---|---|
| Input price / 1M | $10.00 | $0.20 |
| Output price / 1M | $50.00 | $1.20 |
| Context window | 1M tokens | 1.1M tokens |
| Max output | 128K tokens | 128K tokens |
| Vision input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Prompt caching | Yes | Yes |
| Computer use | Yes | N/A |
| Provider | Anthropic PBC | OpenAI Inc. |
Questions people ask
Is claude-fable-5.1 better than gpt-5.6-luna?
claude-fable-5.1 outperforms gpt-5.6-luna on 5 of 5 shared benchmarks. See the benchmark comparison above for specifics: claude-fable-5.1 and gpt-5.6-luna have different strengths across reasoning, coding, math and multimodal tasks.
Which is cheaper, claude-fable-5.1 or gpt-5.6-luna?
gpt-5.6-luna is cheaper. claude-fable-5.1 costs $10.00/$50.00 per 1M input/output tokens, while gpt-5.6-luna costs $0.20/$1.20.
Can I use claude-fable-5.1 and gpt-5.6-luna 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 "openai/gpt-5.6-luna", no other code changes needed.
What are the context windows?
claude-fable-5.1 supports up to 1M tokens of context. gpt-5.6-luna supports up to 1.1M 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 gpt-5.6-luna with one line of code
Requesty provides a single OpenAI-compatible API for 600+ models. Change the model parameter, not your code.