Model comparison - Open weights vs closed
Claude Haiku 5.5 vs DeepSeek V4.1 Flash
Claude Haiku 5.5 is from Anthropic and DeepSeek V4.1 Flash is from DeepSeek. On list price, DeepSeek V4.1 Flash charges 3x Claude Haiku 5.5's input price ($0.30 vs $0.10 per 1M tokens), and DeepSeek V4.1 Flash charges 2.4x Claude Haiku 5.5's output price ($1.20 vs $0.50 per 1M tokens). Claude Haiku 5.5 and DeepSeek V4.1 Flash both have a 1,000,000-token context window; max output is 128,000 and 393,216 tokens per response. Claude Haiku 5.5 was released on October 7, 2026 and DeepSeek V4.1 Flash on September 10, 2026. DeepSeek V4.1 Flash publishes open weights (MIT); Claude Haiku 5.5 is closed-weights.
Last verified from each provider's pricing page. All sources
Side-by-side specs
| Spec | Claude Haiku 5.5 | DeepSeek V4.1 Flash |
|---|---|---|
| Provider | Anthropic | DeepSeek |
| Input / 1M tokens | $0.10 | $0.30 |
| Output / 1M tokens | $0.50 | $1.20 |
| Cache read / 1M | $0.01 | $0.006 |
| Cache write / 1M | $0.125 | - |
| Batch input / 1M | $0.05 | - |
| Batch output / 1M | $0.25 | - |
| Long-context rates above | 100,000 tokens | - |
| Context window | 1,000,000 | 1,000,000 |
| Max output | 128,000 | 393,216 |
| Release date | ||
| Weights | Closed | Open |
| License | - | MIT |
| API model id | claude-haiku-5-5 | deepseek-flash |
| AI Gateway id | anthropic/claude-haiku-5.5 | deepseek/deepseek-v4.1-flash-1017 |
| Last verified |
Prices in USD per 1M tokens at each provider's standard first-party rate. A dash means the provider does not bill that item separately or no primary page states it.
What each costs in practice
The same three workloads every model page uses, worked from each model's standard list rates. Swap in your own token counts with the math on each model's page.
| Workload | Claude Haiku 5.5 | DeepSeek V4.1 Flash |
|---|---|---|
| One agent session1M input tokens and 100K output tokens, no caching. | $0.15 | $0.42 |
| A chat app10,000 requests a day at 2K input and 500 output tokens each. | $4.50$135.00 per 30-day month | $12.00$360.00 per 30-day month |
| The same session at a 90% cache hit90% of the input is read from the prompt cache. The one-time cache write premium is not included. | $0.069 | $0.1554 |
Show the math
Claude Haiku 5.5
- One agent sessionInput: 1M x $0.10 = $0.10Output: 0.1M x $0.50 = $0.05
- A chat appInput: 20M x $0.10 = $2.00Output: 5M x $0.50 = $2.50
- The same session at a 90% cache hitCached input: 0.9M x $0.01 = $0.009Uncached input: 0.1M x $0.10 = $0.01Output: 0.1M x $0.50 = $0.05
DeepSeek V4.1 Flash
- One agent sessionInput: 1M x $0.30 = $0.30Output: 0.1M x $1.20 = $0.12
- A chat appInput: 20M x $0.30 = $6.00Output: 5M x $1.20 = $6.00
- The same session at a 90% cache hitCached input: 0.9M x $0.006 = $0.0054Uncached input: 0.1M x $0.30 = $0.03Output: 0.1M x $1.20 = $0.12
Benchmarks under the same setting
No board in the benchmark directory lists both Claude Haiku 5.5 and DeepSeek V4.1 Flash under the same setting, so there is no like-for-like score to show here.
Set them up in your tools
Step-by-step guides whose official docs list Claude Haiku 5.5 or DeepSeek V4.1 Flash by model id.
- Use DeepSeek in AiderLists DeepSeek V4.1 Flash
- Use DeepSeek in Claude CodeLists DeepSeek V4.1 Flash
- Use DeepSeek in ClineLists DeepSeek V4.1 Flash
- Use DeepSeek in Codex CLILists DeepSeek V4.1 Flash
- Use DeepSeek in ContinueLists DeepSeek V4.1 Flash
- Use DeepSeek in GitHub CopilotLists DeepSeek V4.1 Flash
- Use DeepSeek in GooseLists DeepSeek V4.1 Flash
- Use DeepSeek in Kilo CodeLists DeepSeek V4.1 Flash
- Use DeepSeek in OpenCodeLists DeepSeek V4.1 Flash
- Use DeepSeek in Roo CodeLists DeepSeek V4.1 Flash
- Use DeepSeek in ZedLists DeepSeek V4.1 Flash
Model pages
FAQ
How do Claude Haiku 5.5 and DeepSeek V4.1 Flash compare on price?
On list price, DeepSeek V4.1 Flash charges 3x Claude Haiku 5.5's input price ($0.30 vs $0.10 per 1M tokens), and DeepSeek V4.1 Flash charges 2.4x Claude Haiku 5.5's output price ($1.20 vs $0.50 per 1M tokens). For one agent session of 1M input and 100K output tokens with no caching, that is $0.15 on Claude Haiku 5.5 and $0.42 on DeepSeek V4.1 Flash. Prices are each provider's first-party list rates, verified October 17, 2026 and October 17, 2026.
What are the context windows of Claude Haiku 5.5 and DeepSeek V4.1 Flash?
Claude Haiku 5.5 and DeepSeek V4.1 Flash both have a 1,000,000-token context window; max output is 128,000 and 393,216 tokens per response.
Are Claude Haiku 5.5 and DeepSeek V4.1 Flash open weights?
Claude Haiku 5.5 is closed-weights and is called through Anthropic's API as claude-haiku-5-5. DeepSeek V4.1 Flash's weights are published at huggingface.co under the MIT.
More comparisons
- Claude Haiku 5.5 vs GPT-6 LunaSimilar price, same tier
- DeepSeek V4.1 Flash vs GPT-6 LunaOpen weights vs closed
- Claude Haiku 5.5 vs GLM-5.3-FlashSimilar price, same tier
- DeepSeek V4.1 Flash vs GLM-5.3-FlashSimilar price, same tier
- Claude Haiku 5.5 vs Qwen3.8-FlashSimilar price, same tier
- DeepSeek V4.1 Flash vs Qwen3.8-FlashSimilar price, same tier
- Claude Haiku 5.5 vs MiniMax-M3Open weights vs closed
- DeepSeek V4.1 Flash vs Gemini 3.5 Flash-LiteSimilar price, same tier
Sources
Claude Haiku 5.5 verified from platform.claude.com; DeepSeek V4.1 Flash verified from api-docs.deepseek.com. This page is as current as the older of the two: .
- https://platform.claude.com/docs/en/about-claude/pricing
- https://api-docs.deepseek.com/quick_start/pricing
- https://platform.claude.com/docs/en/models/haiku-5-5/overview
- https://platform.claude.com/docs/en/about-claude/models/overview
- https://platform.claude.com/docs/en/release-notes/overview
- https://api-docs.deepseek.com/updates
- https://api-docs.deepseek.com/news/news260910
- https://huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash
- https://vercel.com/ai-gateway/models/deepseek-v4-pro
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