Claude Fable 5.1 vs Claude Opus 5
Pick a route and service tier under each model. Prices, the calculator and the verdicts follow your choice.
At a glance
Generated from the rows below
Choose Claude Fable 5.1 for
No clear lead on the rows below.
Choose Claude Opus 5 for
- The lowest cost per typical request ($0.0225)
- Included in 19 subscription plans
- The most routes on Phaseo: 7
The models are statistically tied on the Epoch Capabilities Index: their 95% confidence intervals overlap.
Overview
Pricing
Prices on the route and tier chosen under each model
What will it cost?
Estimate a month of requests on the route and tier chosen for each model
Uses the route and tier chosen under each model, over 30 days. Cached input is billed at the cache-read rate.
Performance
Live gateway traffic
Activity
Tokens sent through Phaseo each day over the last 30 days
None of these models has had traffic through Phaseo in the last 30 days.
Features
Features from the parameters Phaseo routes support
Benchmarks
Only results that two or more of the selected models report get a row
Epoch Capabilities Index Independent
Higher is better · dot is the estimate, band is the 95% confidence interval · Epoch AI, CC BY 4.0
Every interval overlaps, so these models are statistically tied on this index.
Artificial Analysis Intelligence Index Independent
Higher is better · at Max effort · 2 of 2 models tested
Where they rank
The five leaders on each capability index, then the compared models. Each model at its best-scoring setting.
Artificial Analysis Intelligence Index52 models ranked
- #1Claude Opus 5.559.1
- #2GPT-6 Astra56.9
- #3GPT-6.1 Sol54.6
- #4Claude Sonnet 5.554.5
- #5GPT-6.1 Terra51.3
- #8Claude Fable 5.150.0
- #10Claude Opus 544.2
Artificial Analysis Coding Index171 models ranked
- #1Claude Fable 5.181.6
- #2GPT 5.6 Sol78.3
- #3Claude Opus 578.0
- #4GPT-6 Astra77.1
- #5Grok 4.676.8
Artificial Analysis Agentic Index112 models ranked
- #1Claude Fable 5.157.9
- #2Claude Opus 556.5
- #3Qwen 3.8 Max 090256.0
- #4Muse Spark 1.355.5
- #5Qwen 3.8 Flash Next53.6
Epoch Capabilities Index164 models ranked
- #1GPT-6 Astra169.1
- #2GPT-6.1 Sol168.9
- #3Claude Opus 5.5168.4
- #4GPT-6.1 Terra167.8
- #5Claude Fable 5.1166.9
- #8Claude Opus 5164.4
Lab-reported results come from each lab’s own launch materials and may use different settings, so none is marked best. Independent results come from third-party evaluators.
Providers
Where each model runs on Phaseo, with standard-tier prices per 1M tokens. Providers that serve more of these models come first.
To price the whole page on one of these providers, pick it under the model’s name at the top.
Details
Claude Fable 5.1 vs Claude Opus 5: side-by-side summary
Claude Fable 5.1 and Claude Opus 5 are both available through the Phaseo API, so switching between them is a change of model id rather than a new integration.
Claude Fable 5.1 is from Anthropic. It has a 1,000,000-token context window. On its cheapest route it costs $10.00 per 1M input tokens and $50.00 per 1M output tokens.
Claude Opus 5 is from Anthropic. It has a 1,000,000-token context window. On its cheapest route it costs $5.00 per 1M input tokens and $25.00 per 1M output tokens.
Claude Fable 5.1 model details, providers and pricingClaude Opus 5 model details, providers and pricing
Claude Fable 5.1 vs Claude Opus 5 at a glance
| Attribute | Claude Fable 5.1 | Claude Opus 5 |
|---|---|---|
| Lab | Anthropic | Anthropic |
| Input price per 1M tokens | $10.00 | $5.00 |
| Output price per 1M tokens | $50.00 | $25.00 |
| Context window | 1,000,000 tokens | 1,000,000 tokens |
| Max output | 128,000 tokens | 128,000 tokens |
| Artificial Analysis Intelligence Index | 50.0 (#8) | 44.2 (#10) |
Prices are each model's cheapest standard route on Phaseo. Benchmark ranks use each model's best-scoring evaluated setting.
Frequently asked questions
Which is cheaper, Claude Fable 5.1 or Claude Opus 5?
Claude Opus 5 is cheaper for both input and output tokens. Claude Fable 5.1 costs $10.00 per 1M input tokens and $50.00 per 1M output tokens; Claude Opus 5 costs $5.00 and $25.00, each on its cheapest standard route on Phaseo.
Which has the longer context window, Claude Fable 5.1 or Claude Opus 5?
Both have a 1,000,000-token context window.
Which scores higher on the Artificial Analysis Intelligence Index, Claude Fable 5.1 or Claude Opus 5?
Claude Fable 5.1 scores higher on the Artificial Analysis Intelligence Index. Claude Fable 5.1 scores 50.0, ranked #8 of 52. Claude Opus 5 scores 44.2, ranked #10 of 52.
Can I use Claude Fable 5.1 and Claude Opus 5 through one API?
Yes. Both are served through the Phaseo API, so you can switch between them by changing the model id.