Claude Haiku 5.5 vs DeepSeek-V4-Flash-0731: Specs & Benchmark Comparison
Claude Haiku 5.5 is developed by Anthropic, while DeepSeek-V4-Flash-0731 comes from DeepSeek. DeepSeek-V4-Flash-0731 was released in July 2026, and Claude Haiku 5.5 followed 3 months later in October 2026. DeepSeek-V4-Flash-0731 has a published size of about 304 billion parameters; Anthropic has not disclosed the parameter count of Claude Haiku 5.5.
We have 36 benchmark results for Claude Haiku 5.5 and 9 benchmark results for DeepSeek-V4-Flash-0731, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
Claude Haiku 5.5 is the cheaper API at $0.10 per million input tokens and $0.50 per million output tokens, about 40% below DeepSeek-V4-Flash-0731 at $0.14 and $0.28. Both accept a context window of about 1M tokens. Claude Haiku 5.5 accepts text and images as input, while DeepSeek-V4-Flash-0731 accepts text.
| Characteristic | Claude Haiku 5.5 | DeepSeek-V4-Flash-0731 |
|---|---|---|
| Company | Anthropic | DeepSeek |
| Release Date | October 7, 2026 | July 31, 2026 |
| Parameters | — | 304B |
| Multimodal | Yes | No |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 393K |
| Input Price / 1M | $0.10 | $0.14 |
| Output Price / 1M | $0.50 | $0.28 |
| Average Score | 57.7% | 57.5% |
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: Claude Haiku 5.5 — 0.6, DeepSeek-V4-Flash-0731 — 0.6.
DeepSeek-V4-Flash-0731 is 1.4x cheaper: input $0.14/1M vs $0.10/1M tokens.
Same context size: 1M tokens.
Claude Haiku 5.5 is newer: released 10/7/2026 vs 7/31/2026.
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Frequently Asked Questions
Which is better for coding — Claude Haiku 5.5 or DeepSeek-V4-Flash-0731?
Which model is cheaper — Claude Haiku 5.5 or DeepSeek-V4-Flash-0731?
Which has a larger context window — Claude Haiku 5.5 or DeepSeek-V4-Flash-0731?
The Claude Haiku 5.5 and DeepSeek-V4-Flash-0731 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Haiku 5.5 or DeepSeek-V4-Flash-0731 page. See also the complete list of AI model comparisons.