GPT-5.5 Pro vs Sonar Pro
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | GPT-5.5 Pro | Sonar Pro |
|---|---|---|
| Developer | OpenAI | Perplexity |
| Family | Gpt 5 5 | Sonar |
| Model | GPT-5.5 Pro | Sonar Pro |
| Version | GPT-5.5 Pro | Sonar Pro |
| Lifecycle | active | active |
| Released | 2026-04-23 | Unknown |
| Knowledge cutoff | 2025-12-01 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 1,050K | 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 | Openai (Standard), Openrouter (Standard) | Openrouter (Standard), Perplexity (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, citations, search |
13 comparable fields · 8 material differences · Pair passes the primary-source comparison gate
GPT-5.5 Pro Capabilities
Sonar Pro Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
GPT-5.5 ProOpenAI | vs | GPT-6 AstraOpenAI | family variantsimage, text |
Claude Fable 5.1Anthropic | vs | GPT-5.5 ProOpenAI | cross-developer peersimage, text |
 Gemini 3.1 ProGoogle DeepMind | vs | GPT-5.5 ProOpenAI | cross-developer peerstext |
 DeepSeek-V4-ProDeepSeek | vs | GPT-5.5 ProOpenAI | cross-developer peerstext |
GPT-5.5 ProOpenAI | vs | Grok 4.6xAI | cross-developer peersimage, text |
GPT-5.5 ProOpenAI | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text |
 Kimi-K3Moonshot AI | vs | GPT-5.5 ProOpenAI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | GPT-5.5 ProOpenAI | cross-developer peersimage, text |
GPT-5.5 ProOpenAI | vs |  GLM-5.3Z.ai | cross-developer peerstext |
GPT-5.5 ProOpenAI | vs |  Hy4 previewTencent | cross-developer peerstext |
Seed 2.1 ProByteDance Seed | vs | GPT-5.5 ProOpenAI | cross-developer peersimage, text |
 Mistral Large 3Mistral AI | vs | GPT-5.5 ProOpenAI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
GPT-5.5 Pro vs Sonar Pro FAQs
Is GPT-5.5 Pro or Sonar Pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.5 Pro and Sonar Pro, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.5 Pro or Sonar Pro?+
GPT-5.5 Pro is $30.00 and Sonar Pro is $3.00 per million tokens, so Sonar Pro is cheaper on this metric. GPT-5.5 Pro is $180.00 and Sonar Pro is $15.00 per million tokens, so Sonar Pro is cheaper on this metric.
Which has a larger context window, GPT-5.5 Pro or Sonar Pro?+
GPT-5.5 Pro has the larger sourced context window. GPT-5.5 Pro supports 1,050K and Sonar Pro supports 200K.
Which performs better in benchmarks, GPT-5.5 Pro or Sonar Pro?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can GPT-5.5 Pro or Sonar Pro be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.5 Pro is not marked open weight; Sonar Pro is not marked open weight.
Can GPT-5.5 Pro and Sonar Pro understand images?+
GPT-5.5 Pro 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, GPT-5.5 Pro or Sonar Pro?+
Neither has a larger sourced maximum output. GPT-5.5 Pro is 128K and Sonar Pro is —.
Do GPT-5.5 Pro and Sonar Pro support reasoning and tool use?+
GPT-5.5 Pro: 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, GPT-5.5 Pro or Sonar Pro?+
GPT-5.5 Pro has 2 sourced provider routes; Sonar Pro has 2, a tie.
Which offers better value, GPT-5.5 Pro 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.