Claude Sonnet 4.5 vs Sonar Reasoning Pro
At a Glance
| Compare | Claude Sonnet 4.5Anthropic |  Sonar Reasoning ProPerplexity |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #36 of 4627.7 score · 2/3 sources · provisional · missing LiveBench · full-core range 18.5–51.8 | UnrankedNot in the 46-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $3.00Anthropic ↗ · Sep 3, 2026 | $2.00Openrouter ↗ · Sep 22, 2026 |
| Output priceFrom · USD / 1M tokens | $15.00Anthropic ↗ · Sep 3, 2026 | $8.00Openrouter ↗ · Sep 22, 2026 |
| Context windowMaximum documented tokens | 200K | 128K |
| Model facts checked | Sep 3, 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
| Benchmark | Claude Sonnet 4.5 | Sonar Reasoning Pro |
|---|---|---|
| LMArena Search Arenasearch-2026-08-24-d25aabda0010 · arena_rating · leader | 1,158.46100% of row best · rating · claude-sonnet-4-5-search; 95% CI [1153.41447529, 1163.49714967]; votes 127378; rank 24 | 1,138.6098% of row best · rating · ppl-sonar-reasoning-pro-high; 95% CI [1132.86119454, 1144.34164089]; votes 29055; rank 29 |
| Overall ResultCounted from the protocol-matched rows above | 1 benchmark winNo overall winner | 0 benchmark winsNo overall winner |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Side-by-Side Facts
| Field | Claude Sonnet 4.5 | Sonar Reasoning Pro |
|---|---|---|
| Developer | Anthropic | Perplexity |
| Family | Claude 4 | Sonar |
| Model | Claude Sonnet 4.5 | Sonar Reasoning Pro |
| Version | Claude Sonnet 4.5 | Sonar Reasoning Pro |
| Lifecycle | active | active |
| Released | 2025-09-29 | Unknown |
| Knowledge cutoff | 2025-01-01 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 200K | 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, structured_outputs, tools | chat, citations, reasoning, search |
Claude Sonnet 4.5 Capabilities
Sonar Reasoning Pro Capabilities
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Primary Evidence
Sources and Freshness
Questions
Claude Sonnet 4.5 vs Sonar Reasoning Pro FAQs
Is Claude Sonnet 4.5 or Sonar Reasoning Pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Sonnet 4.5 and Sonar Reasoning Pro, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Sonnet 4.5 or Sonar Reasoning Pro?+
Claude Sonnet 4.5 is $3.00 and Sonar Reasoning Pro is $2.00 per million tokens, so Sonar Reasoning Pro is cheaper on this metric. Claude Sonnet 4.5 is $15.00 and Sonar Reasoning Pro is $8.00 per million tokens, so Sonar Reasoning Pro is cheaper on this metric.
Which has a larger context window, Claude Sonnet 4.5 or Sonar Reasoning Pro?+
Claude Sonnet 4.5 has the larger sourced context window. Claude Sonnet 4.5 supports 200K and Sonar Reasoning Pro supports 128K.
Which performs better in benchmarks, Claude Sonnet 4.5 or Sonar Reasoning Pro?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Claude Sonnet 4.5 or Sonar Reasoning Pro be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Sonnet 4.5 is not marked open weight; Sonar Reasoning Pro is not marked open weight.
Can Claude Sonnet 4.5 and Sonar Reasoning Pro understand images?+
Claude Sonnet 4.5 is documented with image input; Sonar Reasoning Pro is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Sonnet 4.5 or Sonar Reasoning Pro?+
Neither has a larger sourced maximum output. Claude Sonnet 4.5 is 64K and Sonar Reasoning Pro is —.
Do Claude Sonnet 4.5 and Sonar Reasoning Pro support reasoning and tool use?+
Claude Sonnet 4.5: reasoning, tool calling, and image input. Sonar Reasoning Pro: reasoning. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Sonnet 4.5 or Sonar Reasoning Pro?+
Claude Sonnet 4.5 has 1 sourced provider route; Sonar Reasoning Pro has 2, so Sonar Reasoning Pro has broader tracked availability.
Which offers better value, Claude Sonnet 4.5 or Sonar Reasoning Pro?+
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.