Head-to-head comparison
Claude Haiku 5.5vsDeepSeek V4.1 Flash
Claude Haiku 5.5 and DeepSeek V4.1 Flash are the two budget models of autumn 2026, and they arrive at almost the same headline price from opposite philosophies. Haiku is a closed Anthropic model at $0.10/$0.50 for prompts up to 100K tokens, with computer use and an effort setting. V4.1 Flash is MIT-licensed open weights at $0.15/$0.60 off-peak with native vision and a 1M context at one rate.
At a glance
| Claude Haiku 5.5 | DeepSeek V4.1 Flash | |
|---|---|---|
| Category | Chat | Chat |
| Function | Small fast model | Open-weight model |
| Pricing | Paid | Freemium |
| Starting price | $0.10 / $0.50 per million tokens up to 100K-token prompts; $0.50 / $2.50 above | Open weights free; API $0.15 / $0.60 per million tokens off-peak (double at peak), cache hits $0.003 |
| Released | October 2026 | September 2026 |
Claude Haiku 5.5
Pros
- Roughly a 90% price cut for the short prompts that make up most traffic
- Effort control lets one model cover cheap and careful tasks
- Computer use at a budget price point
Cons
- Long prompts cost five times more — and the higher rate applies to the whole request
- Temperature, top_p, and top_k parameters now return errors; code from Haiku 4.5 needs updating
- Benchmarks are Anthropic's own
DeepSeek V4.1 Flash
Pros
- The most permissive licence in the 500B+ class at release
- Very low API prices even after the September increase
- Vision without a separate model
Cons
- Self-hosting a ~750B model is out of reach for most teams
- Peak-hour pricing is double
- Chinese-hosted API considerations for data
Which one should you pick?
Pick Claude Haiku 5.5 if
You need computer-use or browser-use at budget prices, you already run Claude and want one vendor, or your prompts are short and numerous.
See Claude Haiku 5.5 details →Pick DeepSeek V4.1 Flash if
You want open weights you can self-host or route through OpenRouter, your prompts are long (no 100K cliff), or you need vision at the lowest price.
See DeepSeek V4.1 Flash details →Bottom line
Haiku 5.5 for short, high-volume agent and classification work inside the Anthropic stack. V4.1 Flash for open weights, long prompts, and vision. Both are cheap enough that the deciding factor is licence and data policy, not price.