Claude Sonnet 4.6 vs GPT-4o Search Preview
Claude Sonnet 4.6 (2026) and GPT-4o Search Preview (2025) are frontier reasoning models from Anthropic and OpenAI. Claude Sonnet 4.6 ships a 1M-token context window, while GPT-4o Search Preview ships a 128K-token context window. On pricing, GPT-4o Search Preview costs $2.5/1M input tokens versus $3/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Claude Sonnet 4.6 fits 8x more tokens; pick it for long-context work and GPT-4o Search Preview for tighter calls.
Specs
| Released | 2026-02-17 | 2025-02-26 |
| Context window | 1M | 128K |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Unknown |
| Knowledge cutoff | 2025-12 | - |
Pricing and availability
| Claude Sonnet 4.6 | GPT-4o Search Preview | |
|---|---|---|
| Input price | $3/1M tokens | $2.5/1M tokens |
| Output price | $15/1M tokens | $10/1M tokens |
| Providers |
Capabilities
| Claude Sonnet 4.6 | GPT-4o Search Preview | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on vision: Claude Sonnet 4.6, multimodal input: Claude Sonnet 4.6, reasoning mode: Claude Sonnet 4.6, function calling: Claude Sonnet 4.6, tool use: Claude Sonnet 4.6, and code execution: Claude Sonnet 4.6. Both models share structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude Sonnet 4.6 lists $3/1M input and $15/1M output tokens, while GPT-4o Search Preview lists $2.5/1M input and $10/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts GPT-4o Search Preview lower by about $1.85 per million blended tokens. Availability is 4 providers versus 1, so concentration risk also matters.
Choose Claude Sonnet 4.6 when coding workflow support, larger context windows, and broader provider choice are central to the workload. Choose GPT-4o Search Preview when provider fit and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Claude Sonnet 4.6 or GPT-4o Search Preview?
Claude Sonnet 4.6 supports 1M tokens, while GPT-4o Search Preview supports 128K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Claude Sonnet 4.6 or GPT-4o Search Preview?
GPT-4o Search Preview is cheaper on tracked token pricing. Claude Sonnet 4.6 costs $3/1M input and $15/1M output tokens. GPT-4o Search Preview costs $2.5/1M input and $10/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Sonnet 4.6 or GPT-4o Search Preview open source?
Claude Sonnet 4.6 is listed under Proprietary. GPT-4o Search Preview is listed under Unknown. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude Sonnet 4.6 or GPT-4o Search Preview?
Claude Sonnet 4.6 has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, Claude Sonnet 4.6 or GPT-4o Search Preview?
Claude Sonnet 4.6 has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Claude Sonnet 4.6 and GPT-4o Search Preview?
Claude Sonnet 4.6 is available on OpenRouter, Anthropic, AWS Bedrock, and GCP Vertex AI. GPT-4o Search Preview is available on OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-04-24. Data sourced from public model cards and provider documentation.