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Claude Haiku 4.5 vs DeepSeek V4.1 Flash
A straight cost comparison of Claude Haiku 4.5 (Anthropic) and DeepSeek V4.1 Flash (DeepSeek), per 1,000,000 tokens, verified October 2026.
Rate-by-rate comparison
| Metric | Claude Haiku 4.5 | DeepSeek V4.1 Flash | Winner |
|---|---|---|---|
| Input / 1M | $1 | $0.30 | DeepSeek V4.1 Flash |
| Cached input / 1M | $0.10 | $0.006 | DeepSeek V4.1 Flash |
| Cache write / 1M | $1.25 | — | DeepSeek V4.1 Flash |
| Output / 1M | $5 | $1.20 | DeepSeek V4.1 Flash |
| Context window | 200,000 | 1,100,000 | DeepSeek V4.1 Flash |
| Batch API | Yes | No | Claude Haiku 4.5 |
| Long-context tier | None | None | — |
For per-token metrics, the lower number wins. For context window and batch support, the higher or broader option wins. A dash means the provider does not publish that rate: a missing cache-write fee means writes are not billed per token, while a missing cached-input rate means cache hits bill at the full input rate.
Blended cost: 1M input + 250K output
| Model | Blended cost | Difference |
|---|---|---|
| Claude Haiku 4.5 | $2.25 | +$1.65 |
| DeepSeek V4.1 Flash | $0.60 | Cheaper |
Three workloads, two bills
| Workload | Claude Haiku 4.5 | DeepSeek V4.1 Flash | Winner |
|---|---|---|---|
| Support chat 1,000 requests · 4K input / 600 output | $7 | $1.92 | DeepSeek V4.1 Flash |
| RAG with caching 1,000 requests · 50K input (45K cached) / 1K output | $14.55 | $2.98 | DeepSeek V4.1 Flash |
| Nightly batch job 10,000 requests · 10K input / 2K output | $100 | $54 | DeepSeek V4.1 Flash |
Which one should you pick?
Claude Haiku 4.5 wins on none of the three workloads above, while DeepSeek V4.1 Flash wins on support chat, cached RAG, nightly batch job.
Beyond price, the two differ on input rate ($1 vs $0.30); output rate ($5 vs $1.20); cached-input rate ($0.10 vs $0.006); cache-write rate ($1.25 vs —); context window (200,000 vs 1,100,000); batch support (yes vs no).
Batch mode is available on Claude Haiku 4.5, which halves the nightly job. Both publish cached-input discounts, so a stable system prompt is worth caching on either.
FAQ
Is Claude Haiku 4.5 cheaper than DeepSeek V4.1 Flash?
On a blended 1M-input-plus-250K-output workload, DeepSeek V4.1 Flash is cheaper by 73% ($0.60 vs $2.25). The gap changes for cache-heavy prompts and for batch jobs, as the workload table shows.
Which handles longer prompts, Claude Haiku 4.5 or DeepSeek V4.1 Flash?
Claude Haiku 4.5 has the larger context window (1,100,000 vs 200,000 tokens). Neither model publishes a long-context surcharge.
Do both models support prompt caching?
Claude Haiku 4.5 bills cached reads at $0.10 per 1M; DeepSeek V4.1 Flash at $0.006.