$ diff claude-fable-5-1 gpt-5-6-sol
Claude Fable 5.1 vs GPT-5.6 Sol
Values come from Claude Fable 5.1 and GPT-5.6 Sol, 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
- 1.1M
- weights
- closed
- $/M in
- $4
- $/M out
- $20
What actually differs
- Context window
- GPT-5.6 Sol takes 1.1M against 1M — modestly more room in a single request.
- Input price
- GPT-5.6 Sol at $4/M against $10/M — 2.5× cheaper to feed.
- Output price
- GPT-5.6 Sol at $20/M against $50/M — 2.5× cheaper to generate. Output dominates the bill on most agentic workloads, where the model writes far more than it reads.
- Recency
- Claude Fable 5.1 shipped 54 days after GPT-5.6 Sol (2026-09-01 vs 2026-07-09).
Full spec
| Attribute | Claude Fable 5.1 | GPT-5.6 Sol |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Released | 2026-09-01 | 2026-07-09 |
| Context window | 1M tokens | 1.05M tokens |
| Pricing | $10/M input · $50/M output · cache reads $0.25/M | $4/M input · $20/M output (Sol, promotional from 2026-08-21 through at least 2026-11-21; list $5/M · $30/M; family tiers below) |
| License | proprietary (API-only; no weight release) | proprietary (API-only; no weight release) |
| Availability | Claude API as `claude-fable-5-1`; plan-tier access is disputed — see `## Conflicting Reports` | ChatGPT (subscription), API |