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Comparison · 2 models · Updated Nov 2, 2026

Claude Haiku 5.5 vs DeepSeek V4.1 Flash

Claude Haiku 5.5 comes out ahead, 83 to 72 on our weighted score, and it is the cheaper option too.

  1. Our pick

    Anthropic

    Claude Haiku 5.5

    Released Oct 7, 2026New

    83/100
    • ECI160.4
    • Price$0.10 / $0.50
    • Context1M
    Full specs Remove Claude Haiku 5.5

  2. DeepSeek

    DeepSeek V4.1 Flash

    Released Sep 10, 2026New

    72/100
    • ECI156.1
    • Price$0.28 / $1.20
    • Context1M
    Full specs Remove DeepSeek V4.1 Flash

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Claude Haiku 5.5 is our pick

Claude Haiku 5.5 is the better all-round choice, scoring 83/100 against DeepSeek V4.1 Flash (72). It leads on capability, price and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityClaude Haiku 5.5Capabilities Index (ECI): Claude Haiku 5.5 160.4 · DeepSeek V4.1 Flash 156.1
  • Lowest priceClaude Haiku 5.5Claude Haiku 5.5 $0.20 · DeepSeek V4.1 Flash $0.51 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameClaude Haiku 5.5 1,000,000 · DeepSeek V4.1 Flash 1,000,000 tokens
  • Widest inputsClaude Haiku 5.5Claude Haiku 5.5: Text, Images, PDFs · DeepSeek V4.1 Flash: Text, Images
  • Self-hostingDeepSeek V4.1 FlashPublishes downloadable weights (MIT)
How the score is built
MeasureWeightClaude Haiku 5.5DeepSeek V4.1 Flash
CapabilityCapabilities Index (ECI)50%8984
Price25%8061
Inputs & features15%8060
Context window10%6060
Overall100%83/10072/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

Claude Haiku 5.5 vs DeepSeek V4.1 Flash specifications side by side
SpecificationClaude Haiku 5.5AnthropicDeepSeek V4.1 FlashDeepSeek
Capability
Capabilities Index (ECI)160.4 (best)156.1
ECI rank#14 of 165 (best)#34 of 165
GPQA DiamondGraduate-level science questions89.7%89.8% (best)
FrontierMath Tiers 1–3Research-level mathematics75.1% (best)67.4%
OTIS Mock AIME 2024–2025Competition mathematics98.9% (best)98.3%
SimpleQA VerifiedShort factual questions23.8%42.9% (best)
Price per million tokens
Input$0.10 (best)$0.28
Output$0.50 (best)$1.20
Cached input$0.01—
Blended (3:1)$0.20 (best)$0.51
Long-context rateOver 100K: $0.50 / $2.50Same rate
Price sourceOfficial Anthropic APIMedian of 61 providers
Limits
Context window1,000,000 tokens1,000,000 tokens
Max output128,000 tokens384,000 tokens (best)
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesNo
AudioNoNo
VideoNoNo
ReasoningYeslow · medium · high · xhigh · maxYes
Tool callingYesYes
Structured outputYesNo
Availability
WeightsProprietaryOpenMIT
API model IDclaude-haiku-5-5—
API providers3364 (best)
ReleasedOct 7, 2026Sep 10, 2026
Knowledge cutoffJun 2026May 2025
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • Claude Haiku 5.5$2.00
  • DeepSeek V4.1 Flash$5.20
04 — Questions

Which should you choose?

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

Claude Haiku 5.5 is the better all-round choice, scoring 83/100 against DeepSeek V4.1 Flash (72). It leads on capability, price and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

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

Claude Haiku 5.5 is cheaper at $0.10 input / $0.50 output per million tokens (official Anthropic API price). DeepSeek V4.1 Flash costs $0.28 input / $1.20 output per million tokens (median across 61 API providers). At a typical mix of three input tokens to one output token, that is $0.20 per million tokens for Claude Haiku 5.5 versus $0.51 for DeepSeek V4.1 Flash (2.6× as much).

Which scores higher on benchmarks?

Claude Haiku 5.5 scores higher on the Capabilities Index (ECI): Claude Haiku 5.5 160.4 (#14 of 165) and DeepSeek V4.1 Flash 156.1 (#34 of 165). The confidence ranges of the top two overlap (157.3–163.8 vs 153.7–158.3), so treat the gap as small. On individual benchmarks: GPQA Diamond — DeepSeek V4.1 Flash 89.8%, Claude Haiku 5.5 89.7%; FrontierMath Tiers 1–3 — Claude Haiku 5.5 75.1%, DeepSeek V4.1 Flash 67.4%; OTIS Mock AIME 2024–2025 — Claude Haiku 5.5 98.9%, DeepSeek V4.1 Flash 98.3%; SimpleQA Verified — DeepSeek V4.1 Flash 42.9%, Claude Haiku 5.5 23.8%.

Which is better for coding?

There are no published SWE-bench Verified results for Claude Haiku 5.5 and DeepSeek V4.1 Flash yet, so there is no like-for-like coding score. On overall capability, Claude Haiku 5.5 leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

Claude Haiku 5.5 and DeepSeek V4.1 Flash share the same 1,000,000-token context window. Maximum output per response: Claude Haiku 5.5 up to 128,000, DeepSeek V4.1 Flash up to 384,000 tokens.

Which can read images, PDFs, audio or video?

Claude Haiku 5.5 accepts text, images and PDFs; DeepSeek V4.1 Flash accepts text and images. Claude Haiku 5.5 handles the widest range of inputs.

Are any of these open source?

DeepSeek V4.1 Flash publishes its weights (MIT) and can be self-hosted; Claude Haiku 5.5 is proprietary.

Which is newer?

Claude Haiku 5.5 is the newest, released Oct 7, 2026. DeepSeek V4.1 Flash came out Sep 10, 2026. Knowledge cutoff: Claude Haiku 5.5 Jun 2026, DeepSeek V4.1 Flash May 2025.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.

05 — Keep comparing

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