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 — DeepSeek
DeepSeek V3.5 is a mixture-of-experts model with 685B total parameters and 37B activated per token. Notable for delivering frontier performance at a fraction of the training cost of competing models.
| Property | Claude 4.5 Sonnet | DeepSeek V3.5 |
|---|---|---|
| Released | May 8, 2026 | Mar 24, 2026 |
| Developer | Anthropic | DeepSeek |
| Type | multimodal | llm |
| License | proprietary | open-weight |
| Context window | 1,000,000 | 128,000 |
| Parameters | — | 685B MoE (37B active) |
| Input $/M tokens | $3.00 | $0.27 |
| Output $/M tokens | $15.00 | $1.10 |
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).
Programmatic access available at /api/ai/compare?a=claude-4-5-sonnet&b=deepseek-v3-5. CORS is open. Citation guidance: /about/editorial-process.