Claude Sonnet 5.5 or GPT-6 Sol?
Choose Claude Sonnet 5.5 when sub-second token generation and Claude Code integration are your priority. Choose GPT-6 Sol when mid-turn steering in the Responses API and OpenAI ecosystem tooling fit your existing pipeline.
Lower per-token cost, sub-second latency and desktop control
1M+ context window and flexible reasoning effort levels
Claude Sonnet 5.5
Anthropic's workhorse model with enhanced computer use and sub-second token generation.
Official specification ↗GPT-6 Sol
OpenAI's high-speed frontier reasoning model balancing coding depth and latency.
Official specification ↗Side-by-side comparison
| Category | Claude Sonnet 5.5 | GPT-6 Sol |
|---|---|---|
| Primary focus | Fast coding and computer control | Balanced reasoning and agent tools |
| Standard input / 1M tokens | $2 | $3 |
| Standard output / 1M tokens | $10 | $15 |
| Cached input / 1M tokens | $0.20 | $0.30 |
| Context limit | 500,000 tokens | 1,050,000 tokens |
| Reasoning control | Adaptive thinking budget | none, low, medium, high, max |
| Tool harness | Computer use, Claude Code, bash | Responses API, web search, code interpreter |
| Turn steering | Standard turn-based messages | Mid-turn steering during execution |
| Company | Anthropic | OpenAI |
| Product category | Model · Balanced reasoning model | Model · Reasoning model |
| Current pricing note | $2 input, $0.20 cache read and $10 output per 1M tokens | $3 input, $0.30 cached input and $15 output per 1M tokens |
| Best suited to | Full-stack software development, automated UI testing and production agent workflows | Fast autonomous coding, complex data transformation and tool orchestration |
| Key capabilities | Sub-second latency; Enhanced desktop computer use; 500K context; Claude Code default | 1.05M context; 128K maximum output; Vision & multimodal; Responses API & mid-turn steering |
| Last verified | 2026-10-15 | 2026-10-15 |
| Official product source | https://platform.claude.com/docs/en/models/sonnet-5-5/overview | https://developers.openai.com/api/docs/models/gpt-6-sol |
How we reached this verdict
We looked at the things that affect everyday use: what each product can do, how its plans are structured, where it fits into your existing workflow, and what the provider currently documents. Benchmark results are useful context, but they are not a universal winner score because test settings and tools vary.
Common questions
Claude Sonnet 5.5 or GPT-6 Sol: which should I choose?
Choose Claude Sonnet 5.5 for lower per-token cost, sub-second latency and desktop control. Choose GPT-6 Sol for 1m+ context window and flexible reasoning effort levels. Validate the decision with your own prompts and total task cost.
Is Claude Sonnet 5.5 cheaper than GPT-6 Sol?
Pricing units can differ. Claude Sonnet 5.5: $2 input, $0.20 cache read and $10 output per 1M tokens. GPT-6 Sol: $3 input, $0.30 cached input and $15 output per 1M tokens. Check tool charges, plan limits, caching and long-context rules before comparing totals.
Which is better for coding and agent work?
Capability depends on the selected product surface, tools and harness. Claude Sonnet 5.5 is positioned for full-stack software development, automated ui testing and production agent workflows; GPT-6 Sol is positioned for fast autonomous coding, complex data transformation and tool orchestration. Run the same repository task on both.
How do their context windows compare?
Claude Sonnet 5.5 lists 500K tokens; GPT-6 Sol lists 1.05M tokens. A larger limit does not by itself guarantee better retrieval or lower cost.
Official sources
Use these provider pages to confirm current features, pricing and availability.
AI tools change quickly. We checked this page on 2026-10-15. Before you subscribe, confirm the latest price, regional availability and usage limits on the provider website.