Claude Fable 5.1 and Claude Fable 5.2 compared
Claude Fable 5.1, Claude Fable 5.2, compared side by side on price, context, and capabilities. All are available on Hormouz through one OpenAI-compatible API.
Anthropic Claude Fable 5.1 | Anthropic Claude Fable 5.2 | |
|---|---|---|
| At a glance | ||
| Context window | 1,000,000 | 1,000,000 |
| Input type | text, image, file | text, image, file |
| Output type | text | text |
| Type | text, image | text, image |
| Pricing | ||
| Input | $6/M | $4.8/M |
| Output | $30/M | $24/M |
| Cached input | $0.25/M | $0.2/M |
| Cache write | $12.5/M | $10/M |
| Web search (per 1K calls) | $10/1K | $10/1K |
| Persian text | ||
| Tokens per 100 Persian words | 368 | 368 |
| Persian vs English tokens (same text) | ×2.4 | ×2.4 |
| Input cost of 1,000 Persian words | $0.022 | $0.018 |
| Features | ||
| Thinking (reasoning) | Always on | Always on |
| Max output tokens | 128K | 128K |
| Tool use | Yes | Yes |
| Structured output (JSON) | Yes | Yes |
| Prompt caching | Yes | Yes |
| Capabilities | ||
| Capabilities | Vision · Tools · Streaming · Long context | Vision · Tools · Streaming · Long context |
| Benchmarks | ||
| Coding Index | 82 | — |
| Intelligence Index | 53 | — |
| Agentic Index | 58 | — |
| GPQA DiamondGraduate-level scientific reasoning | 94% | — |
| HLEHumanity's Last Exam | 59% | — |
| AA-LCRLong-context reasoning | 85% | — |
| CritPtResearch-level physics reasoning | 30% | — |
| GDPvalEconomically valuable tasks | 63% | — |
| AA OmniscienceBroad factual knowledge accuracy | 67% | — |
| Non-HallucinationRate of avoiding fabricated answers | 27% | — |
| SciCodePython for scientific computing | 63% | — |
Claude Fable 5.1 and Claude Fable 5.2: side-by-side summary
Claude Fable 5.1, from Anthropic, has a 1,000,000-token context window and costs $6/M for input and $30/M for output on Hormouz (M = one million tokens).
Claude Fable 5.2, from Anthropic, has a 1,000,000-token context window and costs $4.8/M for input and $24/M for output on Hormouz (M = one million tokens).
Both are available through one OpenAI-compatible API and one Hormouz key, and you switch between them by changing the model id in your request.
Where they rank
The compared models' scores beside a few models of similar standing.
Intelligence Index
- Claude Fable 5.264.6
- Claude Opus 5.557.6
- Claude Fable 5.153.4
- GPT-6 Astra52.7
Coding Index
- Claude Fable 5.181.6
- GPT-6 Astra76.9
Agentic Index
- Claude Fable 5.157.9
Data from Artificial Analysis; scores out of 100.
FAQ
- Which has the longer context window, Claude Fable 5.1 or Claude Fable 5.2?
- Claude Fable 5.1 and Claude Fable 5.2 have the same context window: 1,000,000 tokens.
- Which is cheaper, Claude Fable 5.1 or Claude Fable 5.2?
- Claude Fable 5.2 has the lower input price. Claude Fable 5.1: $6/M input, $30/M output and Claude Fable 5.2: $4.8/M input, $24/M output (per million tokens, on Hormouz).
- Which scores higher on intelligence, Claude Fable 5.1 or Claude Fable 5.2?
- Claude Fable 5.2 scores higher on the Artificial Analysis Intelligence Index: 64.6 for Claude Fable 5.2 and 53.4 for Claude Fable 5.1.
- Do Claude Fable 5.1 and Claude Fable 5.2 reason before answering?
- Claude Fable 5.1 always reasons before answering; the reasoning effort setting controls how much. Claude Fable 5.2 always reasons before answering; the reasoning effort setting controls how much.
- Can I use all 2 of these models through one API?
- Yes. All of them are available on Hormouz through a single OpenAI-compatible API and one API key. Switch between them by changing the model id.
View Claude Fable 5.1View Claude Fable 5.2Try Claude Fable 5.1 in the PlaygroundTry Claude Fable 5.2 in the Playground
Updated 2026-11-11