WhichAI.todayClaude Haiku 5.5
Anthropic
Pick this when you want speed and a Claude account.
Skip it when the task is hard enough that Opus or Fable would change the answer.
Artificial Analysis output speed 237 tokens/sec.
Claude Haiku 5.5 vs DeepSeek V4.1 Flash
Updated Nov 13, 2026. Checked daily.
The short answer
Claude Haiku 5.5 ranks ahead in every job we track where either appears (speed & high volume).
Claude Haiku 5.5
1 of 1 job ahead
Free (limited)
DeepSeek V4.1 Flash
0 of 1 job ahead
Free (limited)
Head to head, job by job
Each job ranks a #1, an alternative, and an open-weights pick from public leaderboards. Bars compare the two scores on that job's own signal.
Claude Haiku 5.5DeepSeek V4.1 Flash
Which one should you pick?
DeepSeek V4.1 Flash
DeepSeek
Pick this when the messages cannot leave your own machines.
Skip the hosted chat for private data. The weights can be run on your own machines.
AA Intelligence Index 45.
Price, access, and privacy
Claude Haiku 5.5DeepSeek V4.1 Flash
Cost
Included on the free plan, with limits. API is $0.10 per million input tokens for prompts under 100K tokens.
Chat is free. The API costs a fraction of a dollar per million tokens, with 50% discounts off-peak.
Free tier
Yes, on the free Claude plan, with usage limits.
Yes. The chat site and app are free, with throttling when the service is busy.
Where to get it
Apps
- Claude, Free (Free)
- Cursor, Premium ($30/month)
- GitHub Copilot, Copilot Pro ($10/month)
- Claude Code, Pro ($20/month)
- Cursor, Premium ($30/month)
- Hugging Face, Free (Free)
- Ollama, Pro ($20/month)
Trains on chats
Anthropic says Free, Pro, and Max chats are used for training only if you allow it, and you choose at signup. The toggle has been reported as on by default, so check it. Settings, then Privacy. Turn off Help improve Claude.
Possibly. DeepSeek says some optimization data can come from user input, after de-identification. Use the opt-out described in the DeepSeek privacy policy.
Try both with the same prompt
Claude Haiku 5.5
Reply to this customer in two sentences. Be specific and do not over-promise.
DeepSeek V4.1 Flash
Tag each row as yes or no, and keep the output to a single column.
Want a sharper prompt? Build one for either model.
Questions
Is Claude Haiku 5.5 or DeepSeek V4.1 Flash better for speed & high volume?
Claude Haiku 5.5 ranks ahead for speed & high volume on Artificial Analysis output speed. Claude Haiku 5.5 is the alternative pick (237); DeepSeek V4.1 Flash is the open weights pick.
Which is cheaper, Claude Haiku 5.5 or DeepSeek V4.1 Flash?
Claude Haiku 5.5: Included on the free plan, with limits. API is $0.10 per million input tokens for prompts under 100K tokens. DeepSeek V4.1 Flash: Chat is free. The API costs a fraction of a dollar per million tokens, with 50% discounts off-peak.
Can I use Claude Haiku 5.5 or DeepSeek V4.1 Flash for free?
Claude Haiku 5.5: Yes, on the free Claude plan, with usage limits. DeepSeek V4.1 Flash: Yes. The chat site and app are free, with throttling when the service is busy.
Which is more private, Claude Haiku 5.5 or DeepSeek V4.1 Flash?
Claude Haiku 5.5 (Anthropic): Anthropic says Free, Pro, and Max chats are used for training only if you allow it, and you choose at signup. The toggle has been reported as on by default, so check it. DeepSeek V4.1 Flash (DeepSeek): Possibly. DeepSeek says some optimization data can come from user input, after de-identification.