Anthropic: Claude Sonnet 4.5 vs OpenAI: GPT-4o
Side-by-side specs, pricing, and benchmarks. Pick a winner for your team's use case.
Use it in a Space
Spin up a Switchy Space with either model — your whole team @-mentions it with shared context, pooled credits, one memory.
Anthropic: Claude Sonnet 4.5OpenAI: GPT-4o
Input $/Mtok$3.00 · $2.50
Output $/Mtok$15.00 · $10.00
Anthropic: Claude Sonnet 4.5OpenAI: GPT-4o
Anthropic: Claude Sonnet 4.51000K tokens
OpenAI: GPT-4o128K tokens
Bars use square-root scaling so a 1M-token window doesn't crush a 200K one.
Anthropic: Claude Sonnet 4.5OpenAI: GPT-4o
2025-09-29
2024-05-13
2024-04-13today
Anthropic: Claude Sonnet 4.5
- Provider
- anthropic
- Context
- 1000k
- Input $/Mtok
- $3.00
- Output $/Mtok
- $15.00
- Max output
- 64000
- Modalities
- text, image, file
OpenAI: GPT-4o
- Provider
- openai
- Context
- 128k
- Input $/Mtok
- $2.50
- Output $/Mtok
- $10.00
- Max output
- 16384
- Modalities
- text, image, file
Price delta
Anthropic: Claude Sonnet 4.5 is $0.50/Mtok more expensive than OpenAI: GPT-4o on input. Output: Anthropic: Claude Sonnet 4.5 is $5.00/Mtok more expensive than OpenAI: GPT-4o.
Which to pick
Pick **Claude Sonnet 4.5** when output quality is what you're paying for — coding turns, writing, structured reasoning, multi-step planning. Sonnet leads GPT-4o on most reasoning and code evals, and the 200k context (vs GPT-4o's 128k) covers most full-repo or long-document workflows.
Pick **GPT-4o** for vision-heavy or audio-bound work: chart and screenshot interpretation, document-layout extraction, integrated voice modes. It's slightly cheaper at $2.50 in / $10 out per Mtok versus Sonnet's $3 / $15, but the real reason to choose GPT-4o is multimodality. Text-only? Sonnet wins on quality.