$ diff claude-fable-5-1 kimi-k3
Claude Fable 5.1 vs Kimi K3
Values come from Claude Fable 5.1 and Kimi K3, 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
- $3
- $/M out
- $15
What actually differs
- Context window
- Identical — both accept 1M tokens, so context length is not a reason to pick either.
- Input price
- Kimi K3 at $3/M against $10/M — 3.3× cheaper to feed. Standard rates: one of these labs also quotes a lower cached-input tier, which applies only when a prefix is reused — see the full spec below.
- Output price
- Kimi K3 at $15/M against $50/M — 3.3× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Weights
- Kimi K3 publishes weights (Modified MIT (commercial use permitted; weights publicly downloadable)); 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 47 days after Kimi K3 (2026-09-01 vs 2026-07-16).
Full spec
| Attribute | Claude Fable 5.1 | Kimi K3 |
|---|---|---|
| Developer | Anthropic | Moonshot AI |
| Released | 2026-09-01 | 2026-07-16 |
| Context window | 1M tokens | 1M tokens |
| Pricing | $10/M input · $50/M output · cache reads $0.25/M | $0.30/M cache-hit input · $3.00/M cache-miss input · $15.00/M output |
| License | proprietary (API-only; no weight release) | Modified MIT (commercial use permitted; weights publicly downloadable) |
| Availability | Claude API as `claude-fable-5-1`; plan-tier access is disputed — see `## Conflicting Reports` | Kimi Code, Kimi app, Kimi API; weights on Hugging Face (`moonshot-ai/kimi-k3`, released 2026-07-27) |