Claude Sonnet 4.5 vs Sonar Pro
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Sonnet 4.5 | Sonar Pro |
|---|---|---|
| LMArena Search Arenasearch-2026-08-24-011508720696 · 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 | 1,130.2198% of row best · rating · ppl-sonar-pro-high; 95% CI [1124.48384666, 1135.92956299]; votes 28519; rank 31 |
| Overall ResultCounted from the protocol-matched rows above | 1 benchmark winOverall lead | 0 benchmark wins |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Technical Differences
Side-by-Side Facts
| Field | Claude Sonnet 4.5 | Sonar Pro |
|---|---|---|
| Developer | Anthropic | Perplexity |
| Family | Claude 4 | Sonar |
| Model | Claude Sonnet 4.5 | Sonar Pro |
| Version | Claude Sonnet 4.5 | Sonar 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 | 200K |
| 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, search |
13 comparable fields · 7 material differences · Pair passes the primary-source comparison gate
Claude Sonnet 4.5 Capabilities
Sonar Pro Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
Claude Sonnet 4.5Anthropic | vs |  GPT-6 AstraOpenAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs | Claude Sonnet 4.5Anthropic | family variantsimage, text |
Claude Sonnet 4.5Anthropic | vs |  Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext |
Claude Sonnet 4.5Anthropic | vs |  DeepSeek-V4-ProDeepSeek | cross-developer peerstext |
Claude Sonnet 4.5Anthropic | vs | Grok 4.6xAI | cross-developer peersimage, text |
Claude Sonnet 4.5Anthropic | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text |
Claude Sonnet 4.5Anthropic | vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | Claude Sonnet 4.5Anthropic | cross-developer peersimage, text |
Claude Sonnet 4.5Anthropic | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Claude Sonnet 4.5Anthropic | vs |  Hy4 previewTencent | cross-developer peerstext |
Claude Sonnet 4.5Anthropic | vs | Seed 2.1 ProByteDance Seed | cross-developer peersimage, text |
Claude Sonnet 4.5Anthropic | vs |  Mistral Large 3Mistral AI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Sonnet 4.5 vs Sonar Pro FAQs
Is Claude Sonnet 4.5 or Sonar Pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Sonnet 4.5 and Sonar 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 Pro?+
Claude Sonnet 4.5 is $3.00 and Sonar Pro is $3.00 per million tokens, so they are tied on this metric. Claude Sonnet 4.5 is $15.00 and Sonar Pro is $15.00 per million tokens, so they are tied on this metric.
Which has a larger context window, Claude Sonnet 4.5 or Sonar Pro?+
Neither model has a larger sourced context window in this comparison. Claude Sonnet 4.5 is 200K and Sonar Pro is 200K.
Which performs better in benchmarks, Claude Sonnet 4.5 or Sonar 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 Pro be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Sonnet 4.5 is not marked open weight; Sonar Pro is not marked open weight.
Can Claude Sonnet 4.5 and Sonar Pro understand images?+
Claude Sonnet 4.5 is documented with image input; Sonar 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 Pro?+
Neither has a larger sourced maximum output. Claude Sonnet 4.5 is 64K and Sonar Pro is —.
Do Claude Sonnet 4.5 and Sonar Pro support reasoning and tool use?+
Claude Sonnet 4.5: reasoning, tool calling, and image input. Sonar Pro: none of these features are definitively sourced. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Sonnet 4.5 or Sonar Pro?+
Claude Sonnet 4.5 has 1 sourced provider route; Sonar Pro has 2, so Sonar Pro has broader tracked availability.
Which offers better value, Claude Sonnet 4.5 or Sonar 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.