Claude Fable 5 vs Claude Opus 5
Claude Opus 5 and Claude Fable 5 are Anthropic's current premium decision pair. Anthropic recommends Opus 5 as the starting point for complex agentic coding and enterprise work, while it positions Fable 5 for workloads that need the highest available capability. Both have 1M-token context windows and 128K synchronous output, but Opus 5's standard Claude API price is $5/M input and $25/M output versus Fable 5 at $10/M and $50/M.
Choose Claude Opus 5 when you want the premium everyday route for complex coding, long-running agents, and enterprise analysis at half Fable 5's standard token price. Evaluate Claude Fable 5 when the highest available capability is worth the higher price and its access and safeguard profile fits the workload. Neither model is a universal winner: use setting-matched evaluations and test the provider route, latency, safety behavior, and task mix you actually plan to deploy.
Decision scorecard
Local evidence first| Signal | Claude Fable 5 | Claude Opus 5 |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1M | 1M |
| Cheapest output | $50/1M tokens | $25/1M tokens |
| Provider routes | 8 tracked | 7 tracked |
| Shared benchmarks | CursorBench leader | 6 shared |
Decision tradeoffs
- Claude Fable 5 holds a shared-benchmark lead on CursorBench, ahead by 32.2 points.
- Claude Fable 5 has broader tracked provider coverage for fallback and route flexibility.
- Local decision data tags Claude Fable 5 for Coding, RAG, and Agents.
- Claude Opus 5 has the lower cheapest tracked output price at $25/1M tokens.
- Claude Opus 5 uniquely exposes Code execution and Computer use in local model data.
- Local decision data tags Claude Opus 5 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude Fable 5
$20,500
Cheapest tracked route/tier: Anthropic
Claude Opus 5
$10,250
Cheapest tracked route/tier: Anthropic
Estimated monthly gap: $10,250. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on Anthropic, AWS Bedrock, and GCP Vertex AI; start route-level A/B tests there.
- Claude Opus 5 is $25/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Claude Opus 5 adds Code execution and Computer use in local capability data.
- Provider overlap exists on Anthropic, AWS Bedrock, and GCP Vertex AI; start route-level A/B tests there.
- Claude Fable 5 is $25/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Code execution and Computer use before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-06-09 | 2026-07-24 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Not released |
| Commercial use | Restricted | Restricted |
| Knowledge cutoff | - | 2026-05 |
Pricing and availability
| Pricing attribute | Claude Fable 5 | Claude Opus 5 |
|---|---|---|
| Input price | $10/1M tokens | $5/1M tokens |
| Output price | $50/1M tokens | $25/1M tokens |
| Providers |
Capabilities
| Capability | Claude Fable 5 | Claude Opus 5 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | Yes |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude Fable 5 | Claude Opus 5 |
|---|---|---|
| CursorBench | 72.9 | 40.7 |
| CursorBench | 70.5 | 40.7 |
| CursorBench | 68.4 | 40.7 |
| CursorBench | 66.5 | 40.7 |
| CursorBench | 65.2 | 40.7 |
| CursorBench | 62.1 | 40.7 |
Deep dive
Price is the clearest documented split. Anthropic lists Opus 5 at $5/M input and $25/M output, while Fable 5 is $10/M and $50/M. Both offer 50% Batch API rates and prompt-cache discounts, so the two-to-one base-price relationship remains relevant for long agent loops and large-context workloads.
Headline limits are tied: both models have 1M context and 128K synchronous output. Fable 5's value case is therefore Anthropic's highest-capability positioning, not a larger window. On Opus 5, the effort parameter controls thinking volume and token use across five levels, with high as the default; it does not reliably control visible response length.
The curated head-to-head suppresses SWE-bench Pro and SWE-bench Verified because the available rows use different evaluators, harnesses, and settings. Use each model's benchmark page for its source-specific evidence rather than inferring a winner from incompatible measurements.
Provider coverage should be checked per route. Opus 5 is seeded across Anthropic API, Bedrock, Google Cloud, Microsoft Foundry, OpenRouter, Vercel AI Gateway, and Databricks, with blank prices where the provider did not publish them. Fable 5 has its own access history and safeguard behavior, so teams should confirm live availability instead of assuming the two models are interchangeable.
FAQ
Which is cheaper, Claude Opus 5 or Fable 5?
Claude Opus 5 is half the standard Claude API price: $5/M input and $25/M output versus Fable 5 at $10/M and $50/M. Both have separate batch and prompt-caching discounts.
Which model has more context?
Neither. Claude Opus 5 and Fable 5 are both documented with 1M-token context windows and 128K synchronous output limits.
Is Fable 5 always better than Opus 5?
No universal ranking is supported. Anthropic positions Fable 5 for the highest available capability and Opus 5 for complex agentic coding and enterprise work at the lower Opus price. Evaluate the exact workload and effort setting.
Can I compare their SWE-bench rows directly?
No. The available Opus 5 and Fable 5 rows use different evaluators, harnesses, and settings, so this head-to-head omits them. Review each result with its source-specific methodology instead.
Continue comparing
Last reviewed: 2026-10-17. Data sourced from public model cards and provider documentation.