Claude Sonnet 5 vs GPT-5.5 Pro
Benchmark Performance
Available Benchmarks
Technical Differences
Side-by-Side Facts
| Field | Claude Sonnet 5 | GPT-5.5 Pro |
|---|---|---|
| Developer | Anthropic | Openai |
| Family | Claude 5 | Gpt 5 5 |
| Model | Claude Sonnet 5 | GPT-5.5 Pro |
| Version | Claude Sonnet 5 | GPT-5.5 Pro |
| Lifecycle | active | active |
| Released | 2026-06-30 | 2026-04-23 |
| Knowledge cutoff | Unknown | 2025-12-01 |
| Input modalities | Unknown | Unknown |
| Output modalities | Unknown | Unknown |
| Context window | 1,000,000 | 1,050,000 |
| 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), Deepinfra (Standard), Openrouter (Standard) | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, structured_outputs, tools |
12 comparable fields · 8 material differences · Interactive comparison only; indexing gate not met
Claude Sonnet 5 Capabilities
GPT-5.5 Pro Capabilities
Primary Evidence
Sources and Freshness
Questions
Claude Sonnet 5 vs GPT-5.5 Pro FAQs
Is Claude Sonnet 5 or GPT-5.5 Pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Sonnet 5 and GPT-5.5 Pro, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Sonnet 5 or GPT-5.5 Pro?+
Claude Sonnet 5 is $2.00 and GPT-5.5 Pro is $30.00 per million tokens, so Claude Sonnet 5 is cheaper on this metric. Claude Sonnet 5 is $10.00 and GPT-5.5 Pro is $180.00 per million tokens, so Claude Sonnet 5 is cheaper on this metric.
Which has a larger context window, Claude Sonnet 5 or GPT-5.5 Pro?+
GPT-5.5 Pro has the larger sourced context window. Claude Sonnet 5 supports 1,000,000 and GPT-5.5 Pro supports 1,050,000.
Which performs better in benchmarks, Claude Sonnet 5 or GPT-5.5 Pro?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Claude Sonnet 5 or GPT-5.5 Pro be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Sonnet 5 is not marked open weight; GPT-5.5 Pro is not marked open weight.
Can Claude Sonnet 5 and GPT-5.5 Pro understand images?+
Claude Sonnet 5 is not documented with image input; GPT-5.5 Pro is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Sonnet 5 or GPT-5.5 Pro?+
Neither has a larger sourced maximum output. Claude Sonnet 5 is 128,000 and GPT-5.5 Pro is 128,000.
Do Claude Sonnet 5 and GPT-5.5 Pro support reasoning and tool use?+
Claude Sonnet 5: reasoning and tool calling. GPT-5.5 Pro: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Sonnet 5 or GPT-5.5 Pro?+
Claude Sonnet 5 has 3 sourced provider routes; GPT-5.5 Pro has 2, so Claude Sonnet 5 has broader tracked availability.
Which offers better value, Claude Sonnet 5 or GPT-5.5 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.