Claude Mythos 5.1 vs Sonar Deep Research
At a Glance
| Compare | Claude Mythos 5.1Anthropic |  Sonar Deep ResearchPerplexity |
|---|---|---|
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $10.00Anthropic ↗ · Sep 2, 2026 | $2.00Openrouter ↗ · Sep 22, 2026 |
| Output priceFrom · USD / 1M tokens | $50.00Anthropic ↗ · Sep 2, 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 Mythos 5.1 | Sonar Deep Research |
|---|---|---|
| Developer | Anthropic | Perplexity |
| Family | Claude 5 1 | Sonar |
| Model | Claude Mythos 5.1 | Sonar Deep Research |
| Version | Claude Mythos 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 (Project Glasswing) | Openrouter (Standard), Perplexity (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, citations, reasoning, research, search |
Claude Mythos 5.1 Capabilities
Sonar Deep Research Capabilities
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Primary Evidence
Sources and Freshness
Questions
Claude Mythos 5.1 vs Sonar Deep Research FAQs
Is Claude Mythos 5.1 or Sonar Deep Research better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Mythos 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 Mythos 5.1 or Sonar Deep Research?+
Claude Mythos 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 Mythos 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 Mythos 5.1 or Sonar Deep Research?+
Claude Mythos 5.1 has the larger sourced context window. Claude Mythos 5.1 supports 1,000K and Sonar Deep Research supports 128K.
Which performs better in benchmarks, Claude Mythos 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 Mythos 5.1 or Sonar Deep Research be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Mythos 5.1 is not marked open weight; Sonar Deep Research is not marked open weight.
Can Claude Mythos 5.1 and Sonar Deep Research understand images?+
Claude Mythos 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 Mythos 5.1 or Sonar Deep Research?+
Neither has a larger sourced maximum output. Claude Mythos 5.1 is 128K and Sonar Deep Research is —.
Do Claude Mythos 5.1 and Sonar Deep Research support reasoning and tool use?+
Claude Mythos 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 Mythos 5.1 or Sonar Deep Research?+
Claude Mythos 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 Mythos 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.