$ diff claude-fable-5-1 inkling
Claude Fable 5.1 vs Inkling
Values come from Claude Fable 5.1 and Inkling, 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
- 1M
- weights
- open
- $/M in
- —
- $/M out
- —
What actually differs
- Context window
- Identical — both accept 1M tokens, so context length is not a reason to pick either.
- Weights
- Inkling publishes weights (Apache 2.0 (open-weight)); 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 48 days after Inkling (2026-09-01 vs 2026-07-15).
Full spec
| Attribute | Claude Fable 5.1 | Inkling |
|---|---|---|
| Developer | Anthropic | Thinking Machines |
| Released | 2026-09-01 | 2026-07-15 |
| Context window | 1M tokens | 1M |
| Pricing | $10/M input · $50/M output · cache reads $0.25/M | not recorded |
| License | proprietary (API-only; no weight release) | Apache 2.0 (open-weight) |
| Availability | Claude API as `claude-fable-5-1`; plan-tier access is disputed — see `## Conflicting Reports` | Hugging Face (BF16 and NVFP4), Tinker (fine-tuning), SGLang, vLLM, llama.cpp, Unsloth |