Claude Sonnet 4.6 vs GPT-5.5 Pro
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Quick verdict: which should you choose?
Choose Claude Sonnet 4.6 if you need
- ✓Choose GPT-5.5 Pro if you need a 1.05M-token context window with native file, image, and text support.
- ✓Choose GPT-5.5 Pro if you need seamless multimodal integration and strong reasoning over very long inputs.
- ✓Choose GPT-5.5 Pro if maximum context size outweighs cost and unknown speed metrics.
Choose GPT-5.5 Pro if you need
- ✓Choose Claude Sonnet 4.6 if you need dramatically lower output pricing at $15 per million tokens.
- ✓Choose Claude Sonnet 4.6 if you need a documented output speed of 44.84 tokens per second.
- ✓Choose Claude Sonnet 4.6 if you need strong logical coherence and careful safety alignment on large contexts.
- ✓Choose Claude Sonnet 4.6 if predictable performance on million-token multimodal tasks is priority.
Verdict
GPT-5.5 Pro leads in raw context capacity and native multimodal file handling while Claude Sonnet 4.6 dominates on price and documented speed. GPT-5.5 Pro's 1.05M context and seamless image/text/file integration give it an edge for extended inputs, yet its $180/M output cost is twelve times higher than Claude's. Claude counters with a known 44.84 t/s speed, strong logical coherence, and far lower pricing for comparable million-token contexts.
Claude Sonnet 4.6 vs GPT-5.5 Pro: side by side
| Spec | Claude Sonnet 4.6 | GPT-5.5 Pro | Winner |
|---|---|---|---|
| Intelligence | 34.3 | — | Tie |
| Output speed | 45 t/s | — | Tie |
| Output price | $15.00/1M | $180.00/1M | Claude Sonnet 4.6 |
| Context | 1000K | 1050K | GPT-5.5 Pro |
| Params | — | — | Tie |
| Provider | Anthropic | OpenAI | Tie |
Detailed analysis
Context Window
Winner: GPT-5.5 ProGPT-5.5 Pro offers 1,050,000 tokens versus Claude Sonnet 4.6's 1,000,000 tokens. This gives GPT-5.5 Pro a modest advantage for the longest inputs while both handle million-scale contexts effectively.
Pricing
Winner: Claude Sonnet 4.6Claude Sonnet 4.6 costs $15 per million output tokens compared with GPT-5.5 Pro at $180 per million. The twelve-fold price difference makes Claude far more economical for high-volume use.
Speed & Performance
Winner: Claude Sonnet 4.6Claude Sonnet 4.6 publishes a concrete speed of 44.84 tokens per second. GPT-5.5 Pro provides no speed figure and notes potential latency on maximum-length inputs, leaving Claude with the measurable edge.
Multimodal Integration
Winner: TieBoth models emphasize high-quality multimodal handling at similar context scales. GPT-5.5 Pro explicitly lists native file/image/text support while Claude highlights effective large-context multimodal analysis; neither supports audio or video.
Claude Sonnet 4.6
Pros
- +Strong logical coherence
- +Careful safety alignment
- +Effective handling of large contexts
Cons
- –Conservative refusal patterns on edge cases
- –Slower response times on complex inputs
- –Knowledge limited to training cutoff
GPT-5.5 Pro
Pros
- +Very large context window
- +Native support for files, images, and text
- +Seamless multimodal integration
Cons
- –High resource use with maximum context
- –No audio or video modalities
- –Potential latency on very long inputs
Summary: Claude Sonnet 4.6 vs GPT-5.5 Pro
Select GPT-5.5 Pro when maximum context size and native multimodal breadth are essential regardless of cost. Choose Claude Sonnet 4.6 for strong price-performance balance and documented speed on near-equivalent context lengths. Most users will find Claude the practical default unless the extra 50k tokens or file-native features are required.
Frequently asked questions
It depends: GPT-5.5 Pro offers slightly larger context and explicit native file support while Claude Sonnet 4.6 provides known speed, lower cost, and strong coherence.