GPT-4o vs Claude Sonnet 4.6: Which Is Cheaper in 2026?
A head-to-head pricing breakdown of OpenAI's GPT-4o and Anthropic's Claude Sonnet 4.6 for production workloads.
Choosing between GPT-4o and Claude Sonnet 4.6 in 2026 isn't just about benchmarks — it's about unit economics. At a glance, GPT-4o costs $2.50/M input and $10/M output, while Claude Sonnet 4.6 comes in at $3/M input and $15/M output.
Where each model wins
GPT-4o is consistently cheaper for output-heavy chat workloads. Claude Sonnet 4.6, however, ships with a 200K context window and better long-document reasoning, which can reduce the number of round-trips required.
Cost per 1M conversation
Assume an average chat with 1,500 input tokens and 400 output tokens. GPT-4o costs about $7.75 per 1,000 conversations; Claude Sonnet 4.6 costs about $10.50.
When Claude beats GPT-4o on price
If your prompts exceed 50K tokens and you'd otherwise chunk and retry with GPT-4o, Claude's larger context window often wins on total cost.
Verdict
Use GPT-4o for high-volume chat. Use Claude Sonnet 4.6 for long-context reasoning and agentic tool use.