Claude Fable 5.1 vs Sonar Deep Research
At a Glance
| Compare | Claude Fable 5.1Anthropic |  Sonar Deep ResearchPerplexity |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #1 of 4699.0 score · 3/3 sources · complete | UnrankedNot in the 46-model eligible cohort |
| CostLower is better · Published-token output estimate | #43 of 44$0.824 per LiveBench case | UnrankedNot in the 44-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.5 | #22 of 3851.7 score · 3/3 sources · complete | UnrankedNot in the 38-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $10.00Anthropic ↗ · Sep 3, 2026 | $2.00Openrouter ↗ · Sep 22, 2026 |
| Output priceFrom · USD / 1M tokens | $50.00Anthropic ↗ · Sep 3, 2026 | $8.00Openrouter ↗ · Sep 22, 2026 |
| Context windowMaximum documented tokens | 1,000K | 128K |
| Model facts checked | Sep 2, 2026View model evidence → | Aug 29, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
Side-by-Side Facts
| Field | Claude Fable 5.1 | Sonar Deep Research |
|---|---|---|
| Developer | Anthropic | Perplexity |
| Family | Claude 5 1 | Sonar |
| Model | Claude Fable 5.1 | Sonar Deep Research |
| Version | Claude Fable 5.1 | Sonar Deep Research |
| Lifecycle | active | active |
| Released | 2026-09-01 | Unknown |
| Knowledge cutoff | 2026-06-01 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 1,000K | 128K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Anthropic (Standard) | Openrouter (Standard), Perplexity (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, citations, reasoning, research, search |
Claude Fable 5.1 Capabilities
Sonar Deep Research Capabilities
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Primary Evidence
Sources and Freshness
Questions
Claude Fable 5.1 vs Sonar Deep Research FAQs
Is Claude Fable 5.1 or Sonar Deep Research better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Fable 5.1 and Sonar Deep Research, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Fable 5.1 or Sonar Deep Research?+
Claude Fable 5.1 is $10.00 and Sonar Deep Research is $2.00 per million tokens, so Sonar Deep Research is cheaper on this metric. Claude Fable 5.1 is $50.00 and Sonar Deep Research is $8.00 per million tokens, so Sonar Deep Research is cheaper on this metric.
Which has a larger context window, Claude Fable 5.1 or Sonar Deep Research?+
Claude Fable 5.1 has the larger sourced context window. Claude Fable 5.1 supports 1,000K and Sonar Deep Research supports 128K.
Which performs better in benchmarks, Claude Fable 5.1 or Sonar Deep Research?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Claude Fable 5.1 or Sonar Deep Research be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Fable 5.1 is not marked open weight; Sonar Deep Research is not marked open weight.
Can Claude Fable 5.1 and Sonar Deep Research understand images?+
Claude Fable 5.1 is documented with image input; Sonar Deep Research is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Fable 5.1 or Sonar Deep Research?+
Neither has a larger sourced maximum output. Claude Fable 5.1 is 128K and Sonar Deep Research is —.
Do Claude Fable 5.1 and Sonar Deep Research support reasoning and tool use?+
Claude Fable 5.1: reasoning, tool calling, and image input. Sonar Deep Research: reasoning. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Fable 5.1 or Sonar Deep Research?+
Claude Fable 5.1 has 1 sourced provider route; Sonar Deep Research has 2, so Sonar Deep Research has broader tracked availability.
Which offers better value, Claude Fable 5.1 or Sonar Deep Research?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.