Claude Fable 5.2 and Claude Opus 5.5 compared
Claude Fable 5.2, Claude Opus 5.5, compared side by side on price, context, and capabilities. All are available on Hormouz through one OpenAI-compatible API.
Fable 5.2 or Opus 5.5? The short answer
Both are from Anthropic, with a 1-million-token context window, replies of up to 128,000 tokens and the same tokenizer, so the same text (Persian or English) costs the same number of tokens on either. They differ in strength and price.
Fable 5.2 (released 9 November 2026) is Anthropic's strongest model: it scores 64.6 on the Artificial Analysis Intelligence Index against Opus 5.5's 59.1. Pick Fable 5.2 for agent sessions that run for hours, multi-step research, and analysis that has to end in a finished document or spreadsheet.
Opus 5.5 costs half of Fable 5.2's list price and is strong at multi-step changes across large codebases, code review, bug hunting and reading charts and screenshots. For everyday programming, and anywhere cost matters, Opus 5.5 is enough. One Hormouz key reaches both, so you can send the hard work to Fable 5.2 and the rest to Opus 5.5.
Anthropic Claude Fable 5.2 | Anthropic Claude Opus 5.5 | |
|---|---|---|
| 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 | $4.8/M | $2.4/M |
| Output | $24/M | $12/M |
| Cached input | $0.2/M | $0.2/M |
| Cache write | $10/M | $5/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 | $0.018 | $0.0088 |
| 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 | ||
| Intelligence Index | — | 58 |
| HLEHumanity's Last Exam | — | 61% |
| AA-LCRLong-context reasoning | — | 85% |
| CritPtResearch-level physics reasoning | — | 32% |
| GDPvalEconomically valuable tasks | — | 68% |
| AA OmniscienceBroad factual knowledge accuracy | — | 66% |
| Non-HallucinationRate of avoiding fabricated answers | — | 41% |
| SciCodePython for scientific computing | — | 67% |
Claude Fable 5.2 and Claude Opus 5.5: side-by-side summary
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).
Claude Opus 5.5, from Anthropic, has a 1,000,000-token context window and costs $2.4/M for input and $12/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
Data from Artificial Analysis; scores out of 100.
FAQ
- Is Fable 5.2 better than Opus 5.5?
- On the Artificial Analysis Intelligence Index, Fable 5.2 is ahead (64.6 against 59.1) and it is built for long agent work. Opus 5.5 costs half as much and is enough for everyday programming and code review.
- Which is cheaper for Persian text?
- Opus 5.5. Both use the same tokenizer, so a Persian text costs the same number of tokens on either; the cost depends only on the price per token, and Opus 5.5 is half of Fable 5.2's list price.
- Which has the longer context window, Claude Fable 5.2 or Claude Opus 5.5?
- Claude Fable 5.2 and Claude Opus 5.5 have the same context window: 1,000,000 tokens.
- Which is cheaper, Claude Fable 5.2 or Claude Opus 5.5?
- Claude Opus 5.5 has the lower input price. Claude Fable 5.2: $4.8/M input, $24/M output and Claude Opus 5.5: $2.4/M input, $12/M output (per million tokens, on Hormouz).
- Which scores higher on intelligence, Claude Fable 5.2 or Claude Opus 5.5?
- Claude Fable 5.2 scores higher on the Artificial Analysis Intelligence Index: 64.6 for Claude Fable 5.2 and 57.6 for Claude Opus 5.5.
- Do Claude Fable 5.2 and Claude Opus 5.5 reason before answering?
- Claude Fable 5.2 always reasons before answering; the reasoning effort setting controls how much. Claude Opus 5.5 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.
Updated 2026-11-11