Side-by-side comparison of pricing, context window, benchmarks, capabilities, and license. Data sourced from the Interestana AI Index, kept current as developers update their models.
Model A — Anthropic
Claude 4.5 Sonnet is Anthropic’s state-of-the-art coding and tool-use model, leading the SWE-bench coding benchmark and powering Claude Code, Claude.ai, and Claude in the Anthropic API.
Model B — OpenAI
GPT-5 is OpenAI’s next-generation multimodal model, extending native video understanding, audio synthesis, and unified reasoning across modalities in a single forward pass.
| Property | Claude 4.5 Sonnet | GPT-5 |
|---|---|---|
| Released | May 8, 2026 | Mar 18, 2026 |
| Developer | Anthropic | OpenAI |
| Type | multimodal | multimodal |
| License | proprietary | proprietary |
| Context window | 1,000,000 | 1,000,000 |
| Parameters | — | undisclosed |
| Input $/M tokens | $3.00 | $5.00 |
| Output $/M tokens | $15.00 | $20.00 |
Bold green values indicate the winner on that dimension where comparison is meaningful (lower price wins; bigger context wins; more open license wins; newer date wins).
| Benchmark | Claude 4.5 Sonnet | GPT-5 |
|---|---|---|
| MMLU | 90.1% | 92.4% |
| GPQA Diamond | 79.8% | 78.3% |
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