Compare
Claude Fable 5 Default vs Claude Opus 4.6 (Fast)
This page is context-first: how much text each model can take in one request. Full specs adds capabilities and limits; the pricing matrix below is only about $/million tokens from hosts that list both models.
Model
Claude Fable 5 Default
Context window
1M
1,000,000 tokens · ~750K words
Model
Claude Opus 4.6 (Fast)
Context window
1M
1,000,000 tokens · ~750K words
Context window · side by side
Bar length is relative to the larger of the two windows (100% = max of this pair). This is not pricing.
Same context window size for both models.
Claude Fable 5 Default and Claude Opus 4.6 (Fast) have identical context windows (1000K tokens).
Full specs
Context, output, capabilities, and dates. Green highlights the favorable value where we compute a winner.
| Spec | Claude Fable 5 Default | Claude Opus 4.6 (Fast) |
|---|---|---|
| Context window | 1,000,000 tokens (1000K) | 1,000,000 tokens (1000K) |
| Max output tokens | 128,000 tokens (128K) | 128,000 tokens (128K) |
| Speed tier | Balanced | Deep |
| Vision | Yes | Yes |
| Function calling | Yes | Yes |
| Extended thinking | Yes | Yes |
| Prompt caching | Yes | Yes |
| Batch API | Yes | Yes |
| Release date | N/A | Apr 2026 |
Pricing matrix
Dollar rates only: hosts that list both models, per 1M tokens. For how much text fits, use the context section above — not this table.
| Provider | Claude Fable 5 Default in | Claude Fable 5 Default out | Claude Opus 4.6 (Fast) in | Claude Opus 4.6 (Fast) out |
|---|---|---|---|---|
| Google Vertex | $10.00/M | $50.00/M | — | — |
Frequently asked questions
Powered by Mem0
Use a smaller model.
Get better results.
Mem0 gives your AI long-term memory so you stop re-sending context on every call. That means you can use a smaller, faster, cheaper model — and still get better answers.
Example: a multi-turn chat session
80% less to send — works with any model