$ diff claude-fable-5-1 granite-4-2
Claude Fable 5.1 vs Granite 4.2
Values come from Claude Fable 5.1 and Granite 4.2, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
AnthropicClaude Fable 5.1
- context
- 1M
- weights
- closed
- $/M in
- $10
- $/M out
- $50
- context
- 512K
- weights
- open
- $/M in
- —
- $/M out
- —
What actually differs
- Context window
- Claude Fable 5.1 takes 1M against 512K — modestly more room in a single request.
- Weights
- Granite 4.2 publishes weights (Apache 2.0); Claude Fable 5.1 is API-only. That decides self-hosting, air-gapped deployment and fine-tuning before any capability question does.
- Recency
- Claude Fable 5.1 shipped 7 days after Granite 4.2 (2026-09-01 vs 2026-08-25).
Full spec
| Attribute | Claude Fable 5.1 | Granite 4.2 |
|---|---|---|
| Developer | Anthropic | IBM |
| Released | 2026-09-01 | 2026-08-25 |
| Context window | 1M tokens | 512K (30B); unknown (3B, 8B) |
| Pricing | $10/M input · $50/M output · cache reads $0.25/M | not applicable — open weights, no hosted rate published |
| License | proprietary (API-only; no weight release) | Apache 2.0 |
| Availability | Claude API as `claude-fable-5-1`; plan-tier access is disputed — see `## Conflicting Reports` | Hugging Face, Ollama, GitHub |