Anthropic · OpenAI
Claude Sonnet 4.5 vs GPT-5.5
Compare Claude Sonnet 4.5 (Anthropic) and GPT-5.5 (OpenAI) on benchmarks, capabilities, and pricing.
At a glance
| Claude Sonnet 4.5 | GPT-5.5 | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Context | 200K tokens | 1M tokens |
| Modality | Multimodal | Multimodal |
| Pricing | Pro | Max |
| Speed | Fast | Medium |
| Reasoning | Advanced | Expert |
Benchmarks
Claude Sonnet 4.5
- AA Intelligence Index
- Output speed
- API input cost
- API output cost
- Context window
- 200KCatalog · As of Aug 11, 2026Stale · 31d old
Benchmark variant: Claude 4.5 Sonnet (Non-reasoning)
AA data retrieved Sep 11, 2026 · Artificial Analysis
GPT-5.5
- AA Intelligence Index
- Output speed
- API input cost
- API output cost
- Context window
- 1MCatalog · As of Aug 11, 2026Stale · 31d old
Benchmark variant: GPT-5.5 (xhigh)
AA data retrieved Sep 11, 2026 · Artificial Analysis
When to pick Claude Sonnet 4.5
Pick Claude Sonnet 4.5 for production coding agents that edit multi-file repositories, long-context document review across 200K+ tokens, and customer-facing assistants where tone consistency matters. It suits teams already building on Anthropic tool-use patterns, structured XML prompts, and workflows that lean on careful instruction-following over raw breadth.
When to pick GPT-5.5
Pick GPT-5.5 for general-purpose product features tapping the wider OpenAI ecosystem: Assistants API, function calling, vision, and image generation in one stack. It fits teams shipping consumer chat experiences, multimodal pipelines mixing text and images, and applications that benefit from broad plugin and SDK support across languages.
Switch between Claude Sonnet 4.5 and GPT-5.5 per task with one account.
Frequently asked
- Which is faster, Claude Sonnet 4.5 or GPT-5.5?
- Claude Sonnet 4.5 is rated fast and GPT-5.5 is rated medium. yno.ai surfaces output-speed scores from Artificial Analysis on each model's detail page so you can compare exact tokens-per-second figures for your workload.
- Which is cheaper, Claude Sonnet 4.5 or GPT-5.5?
- Claude Sonnet 4.5 is on the pro tier in yno.ai; GPT-5.5 is on the max tier. See the pricing page for the latest per-tier limits.
- Which is better for Full-stack development?
- Both models support Full-stack development. Claude Sonnet 4.5 brings Text and image input; GPT-5.5 brings 1.05M context / 128K output. Run a side-by-side eval on your prompts in yno.ai to see which fits your workload.
- Can I use both Claude Sonnet 4.5 and GPT-5.5 in yno.ai?
- Yes. Both are available on yno.ai under your single account; you can route different stages of an agent to different models or A/B test them on the same prompt without per-provider boilerplate.