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Claude Haiku 5.5 vs DeepSeek-V4.1-Flash

Claude Haiku 5.5 and DeepSeek-V4.1-Flash are closely matched at 49.9 and 50.0 on the LLM Stats Score. Claude Haiku 5.5 is 1.6x cheaper per token.

Anthropic · DeepSeek · Updated for 2026

Which is better?

Claude Haiku 5.5 and DeepSeek-V4.1-Flash are closely matched on the overall LLM Stats Score at 49.9 and 50.0.

In the 5 individual benchmarks reported for both models, Claude Haiku 5.5 wins 4; this is a narrower head-to-head signal than the composite indexes.

On price, Claude Haiku 5.5 is roughly 1.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

DeepSeek-V4.1-Flash also accepts a larger context window (1,040,000 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Haiku 5.5

  • you value its reported benchmark strengths — it wins 4 of 5 exact shared results
  • cost matters — it's about 1.6x cheaper per token
  • you want the most recent training data — it shipped Oct 2026

Choose DeepSeek-V4.1-Flash

  • you process long inputs — it offers a 1,040,000 token context window
  • you need open weights you can self-host or fine-tune

At a glance

The differences that matter most.

Claude Haiku 5.5
Anthropic
DeepSeek-V4.1-Flash
DeepSeek
Core performance indexes
LLM Stats Score
49.9
#20
50.0
#19
Reasoning
47.5
#25
48.0
#22
Coding
39.2
#15
40.5
#10
Agents
33.8
#33
38.3
#11
Cost, coverage & limits
Benchmark wins
4 of 5
1 of 5
Input price
$0.10 / M
$0.22 / M
Output price
$0.50 / M
$0.66 / M
Context window
1,000,000
1,040,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

4 shared
Index
Claude Haiku 5.5
DeepSeek-V4.1-Flash
Math
29.0#95
35.6#43
Vision
30.5#38
30.6#37
Tool use
20.3#66
32.3#5
Multimodal
31.3#33
32.3#24
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

36 reported for Claude Haiku 5.5 · 20 for DeepSeek-V4.1-Flash

5 shared

Claude Haiku 5.5 outperforms in 4 benchmarks (Chartography, Humanity's Last Exam (no tools, text-only), Program Bench, Terminal-Bench 4.0), while DeepSeek-V4.1-Flash is better at 1 benchmark (Humanity's Last Exam (with tools)).

Claude Haiku 5.5 significantly outperforms across most benchmarks.

Thu Oct 22 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Claude Haiku 5.5 costs less

For input processing, Claude Haiku 5.5 ($0.10/1M tokens) is 2.2x cheaper than DeepSeek-V4.1-Flash ($0.22/1M tokens).

For output processing, Claude Haiku 5.5 ($0.50/1M tokens) is 1.3x cheaper than DeepSeek-V4.1-Flash ($0.66/1M tokens).

In conclusion, DeepSeek-V4.1-Flash is more expensive than Claude Haiku 5.5.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Thu Oct 22 2026 • llm-stats.com
Anthropic
Claude Haiku 5.5
Input tokens$0.10
Output tokens$0.50
Best providerAnthropic
DeepSeek
DeepSeek-V4.1-Flash
Input tokens$0.22
Output tokens$0.66
Best providerFireworks
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

DeepSeek-V4.1-Flash accepts 1,040,000 input tokens compared to Claude Haiku 5.5's 1,000,000 tokens. DeepSeek-V4.1-Flash can generate longer responses up to 393,216 tokens, while Claude Haiku 5.5 is limited to 128,000 tokens.

Anthropic
Claude Haiku 5.5
Input1,000,000 tokens
Output128,000 tokens
DeepSeek
DeepSeek-V4.1-Flash
Input1,040,000 tokens
Output393,216 tokens
Thu Oct 22 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Haiku 5.5 and DeepSeek-V4.1-Flash support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Haiku 5.5

Text
Images
Audio
Video

DeepSeek-V4.1-Flash

Text
Images
Audio
Video

License

Usage and distribution terms

Claude Haiku 5.5 is licensed under a proprietary license, while DeepSeek-V4.1-Flash uses MIT.

License differences may affect how you can use these models in commercial or open-source projects.

Claude Haiku 5.5

Proprietary

Closed source

DeepSeek-V4.1-Flash

MIT

Open weights

Release Timeline

When each model was launched

Claude Haiku 5.5 was released on 2026-10-07, while DeepSeek-V4.1-Flash was released on 2026-09-10.

Claude Haiku 5.5 is 1 month newer than DeepSeek-V4.1-Flash.

Claude Haiku 5.5

Oct 7, 2026

2 weeks ago

3w newer
DeepSeek-V4.1-Flash

Sep 10, 2026

1 months ago

Knowledge Cutoff

When training data ends

Claude Haiku 5.5 has a documented knowledge cutoff of 2026-06-01, while DeepSeek-V4.1-Flash's cutoff date is not specified.

We can confirm Claude Haiku 5.5's training data extends to 2026-06-01, but cannot make a direct comparison without DeepSeek-V4.1-Flash's cutoff date.

Claude Haiku 5.5

Jun 2026

DeepSeek-V4.1-Flash

—

Provider Availability

Claude Haiku 5.5 is available from Anthropic. DeepSeek-V4.1-Flash is available from Fireworks, DeepInfra, Novita.

Claude Haiku 5.5

anthropic logo
Anthropic
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M

DeepSeek-V4.1-Flash

fireworks logo
Fireworks
Input Price:Input: $0.22/1MOutput Price:Output: $0.66/1M
deepinfra logo
Deepinfra
Input Price:Input: $0.30/1MOutput Price:Output: $1.20/1M
novita logo
Novita
Input Price:Input: $0.30/1MOutput Price:Output: $1.20/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Haiku 5.5 and DeepSeek-V4.1-Flash side-by-side, then vote on the output you prefer.

Claude Haiku 5.5
✓ Preferred
DeepSeek-V4.1-Flash
Open in Playground

FAQ

Common questions about Claude Haiku 5.5 vs DeepSeek-V4.1-Flash.

Which is better, Claude Haiku 5.5 or DeepSeek-V4.1-Flash?

Claude Haiku 5.5 and DeepSeek-V4.1-Flash are closely matched on the LLM Stats Score at 49.9 and 50.0. Claude Haiku 5.5 is made by Anthropic and DeepSeek-V4.1-Flash is made by DeepSeek. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Haiku 5.5 compare to DeepSeek-V4.1-Flash in benchmarks?

Claude Haiku 5.5 scores Global-MMLU: 87.8%, MILU: 87.6%, BenchCAD (with Python tool): 87.0%, Chartography: 86.2%, SWE-bench Multilingual: 83.7%. DeepSeek-V4.1-Flash scores CodeForces: 100.0%, GPQA: 90.9%, Terminal-Bench 2.1: 90.6%, BabyVision: 89.6%, CyberGym: 88.1%.

Is Claude Haiku 5.5 cheaper than DeepSeek-V4.1-Flash?

Claude Haiku 5.5 is 2.2x cheaper for input tokens. Claude Haiku 5.5 costs $0.10/M input and $0.50/M output via anthropic. DeepSeek-V4.1-Flash costs $0.22/M input and $0.66/M output via fireworks.

What are the context window sizes for Claude Haiku 5.5 and DeepSeek-V4.1-Flash?

Claude Haiku 5.5 supports 1.0M tokens and DeepSeek-V4.1-Flash supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Haiku 5.5 and DeepSeek-V4.1-Flash?

Key differences include LLM Stats Score (49.9 vs 50.0), context window (1.0M vs 1.0M), input pricing ($0.10 vs $0.22/M), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Haiku 5.5 and DeepSeek-V4.1-Flash?

Claude Haiku 5.5 is developed by Anthropic and DeepSeek-V4.1-Flash is developed by DeepSeek.

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