ZMIME
Comparison · 3 models · Updated Nov 2, 2026

DeepSeek V4.1 Flash 1017 vs Claude Opus 5.5 vs Claude Haiku 5.5

Claude Haiku 5.5 comes out ahead, 83 to 79 and 69 on our weighted score, and it is the cheaper option too.

  1. DeepSeek

    DeepSeek V4.1 Flash 1017

    Released Oct 17, 2026New

    79/100
    • ECI158.8
    • Price$0.15 / $0.60
    • Context1M
    Full specs Remove DeepSeek V4.1 Flash 1017

  2. Anthropic

    Claude Opus 5.5

    Released Sep 22, 2026New

    69/100
    • ECI168.4
    • Price$4.00 / $20.00
    • Context1M
    Full specs Remove Claude Opus 5.5
  3. 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
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 1017 (79) and Claude Opus 5.5 (69). It leads on price. Claude Opus 5.5 wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityClaude Opus 5.5Capabilities Index (ECI): Claude Opus 5.5 168.4 · Claude Haiku 5.5 160.4 · DeepSeek V4.1 Flash 1017 158.8
  • Lowest priceClaude Haiku 5.5Claude Haiku 5.5 $0.20 · DeepSeek V4.1 Flash 1017 $0.263 · Claude Opus 5.5 $8.00 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameDeepSeek V4.1 Flash 1017 1,000,000 · Claude Opus 5.5 1,000,000 · Claude Haiku 5.5 1,000,000 tokens
  • Widest inputsClaude Opus 5.5 and Claude Haiku 5.5DeepSeek V4.1 Flash 1017: Text, Images · Claude Opus 5.5: Text, Images, PDFs · Claude Haiku 5.5: Text, Images, PDFs
  • Self-hostingDeepSeek V4.1 Flash 1017Publishes downloadable weights (MIT)
How the score is built
MeasureWeightDeepSeek V4.1 Flash 1017Claude Opus 5.5Claude Haiku 5.5
CapabilityCapabilities Index (ECI)50%879989
Price25%74780
Inputs & features15%708080
Context window10%606060
Overall100%79/10069/10083/100
02 — Side by side

Every spec in one table

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

DeepSeek V4.1 Flash 1017 vs Claude Opus 5.5 vs Claude Haiku 5.5 specifications side by side
SpecificationDeepSeek V4.1 Flash 1017DeepSeekClaude Opus 5.5AnthropicClaude Haiku 5.5Anthropic
Capability
Capabilities Index (ECI)158.8168.4 (best)160.4
ECI rank#19 of 165#2 of 165 (best)#14 of 165
GPQA DiamondGraduate-level science questions93.2% (best)90.6%89.7%
FrontierMath Tiers 1–3Research-level mathematics71.2%91.2% (best)75.1%
OTIS Mock AIME 2024–2025Competition mathematics99.4%100% (best)98.9%
SimpleQA VerifiedShort factual questions42.5%72.2% (best)23.8%
Price per million tokens
Input$0.15$4.00$0.10 (best)
Output$0.60$20.00$0.50 (best)
Cached input$0.003 (best)$0.20$0.01
Blended (3:1)$0.263$8.00$0.20 (best)
Long-context rateSame rateSame rateOver 100K: $0.50 / $2.50
Price sourceOfficial DeepSeek APIOfficial Anthropic APIOfficial Anthropic API
Limits
Context window1,000,000 tokens1,000,000 tokens1,000,000 tokens
Max output384,000 tokens (best)128,000 tokens128,000 tokens
Inputs and features
TextYesYesYes
ImagesYesYesYes
PDFsNoYesYes
AudioNoNoNo
VideoNoNoNo
ReasoningYeslow · high · maxYeslow · medium · high · xhigh · maxYeslow · medium · high · xhigh · max
Tool callingYesYesYes
Structured outputYesYesYes
Availability
WeightsOpenMITProprietaryProprietary
API model IDdeepseek-flashclaude-opus-5-5claude-haiku-5-5
API providers40 (best)3633
ReleasedOct 17, 2026Sep 22, 2026Oct 7, 2026
Knowledge cutoffMay 2025Jun 2026Jun 2026
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.

  • DeepSeek V4.1 Flash 1017$2.70
  • Claude Opus 5.5$80.00
  • Claude Haiku 5.5$2.00
04 — Questions

Which should you choose?

Which is better: DeepSeek V4.1 Flash 1017, Claude Opus 5.5 or Claude Haiku 5.5?

Claude Haiku 5.5 is the better all-round choice, scoring 83/100 against DeepSeek V4.1 Flash 1017 (79) and Claude Opus 5.5 (69). It leads on price. Claude Opus 5.5 wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, DeepSeek V4.1 Flash 1017, Claude Opus 5.5 or Claude Haiku 5.5?

Claude Haiku 5.5 is cheaper at $0.10 input / $0.50 output per million tokens (official Anthropic API price). DeepSeek V4.1 Flash 1017 costs $0.15 input / $0.60 output per million tokens (official DeepSeek API price); Claude Opus 5.5 costs $4.00 input / $20.00 output per million tokens (official Anthropic API price). 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 $0.263 for DeepSeek V4.1 Flash 1017 (1.3× as much) and $8.00 for Claude Opus 5.5 (40× as much).

Which scores higher on benchmarks?

Claude Opus 5.5 scores higher on the Capabilities Index (ECI): Claude Opus 5.5 168.4 (#2 of 165), Claude Haiku 5.5 160.4 (#14 of 165) and DeepSeek V4.1 Flash 1017 158.8 (#19 of 165). Their confidence ranges do not overlap (165.4–173.0 vs 157.3–163.8), so the gap is a real one. On individual benchmarks: GPQA Diamond — DeepSeek V4.1 Flash 1017 93.2%, Claude Opus 5.5 90.6%, Claude Haiku 5.5 89.7%; FrontierMath Tiers 1–3 — Claude Opus 5.5 91.2%, Claude Haiku 5.5 75.1%, DeepSeek V4.1 Flash 1017 71.2%; OTIS Mock AIME 2024–2025 — Claude Opus 5.5 100%, DeepSeek V4.1 Flash 1017 99.4%, Claude Haiku 5.5 98.9%; SimpleQA Verified — Claude Opus 5.5 72.2%, DeepSeek V4.1 Flash 1017 42.5%, Claude Haiku 5.5 23.8%.

Which is better for coding?

There are no published SWE-bench Verified results for DeepSeek V4.1 Flash 1017, Claude Opus 5.5 and Claude Haiku 5.5 yet, so there is no like-for-like coding score. On overall capability, Claude Opus 5.5 leads, which tends to carry over to coding, but test on your own codebase. All three support tool calling for agent workflows.

Which has the bigger context window?

DeepSeek V4.1 Flash 1017, Claude Opus 5.5 and Claude Haiku 5.5 share the same 1,000,000-token context window. Maximum output per response: DeepSeek V4.1 Flash 1017 up to 384,000, Claude Opus 5.5 up to 128,000, Claude Haiku 5.5 up to 128,000 tokens.

Which can read images, PDFs, audio or video?

DeepSeek V4.1 Flash 1017 accepts text and images; Claude Opus 5.5 accepts text, images and PDFs; Claude Haiku 5.5 accepts text, images and PDFs. Claude Opus 5.5 handles the widest range of inputs.

Are any of these open source?

DeepSeek V4.1 Flash 1017 publishes its weights (MIT) and can be self-hosted; Claude Opus 5.5 and Claude Haiku 5.5 is proprietary.

Which is newer?

DeepSeek V4.1 Flash 1017 is the newest, released Oct 17, 2026. Claude Haiku 5.5 came out Oct 7, 2026; Claude Opus 5.5 came out Sep 22, 2026. Knowledge cutoff: DeepSeek V4.1 Flash 1017 May 2025, Claude Opus 5.5 Jun 2026, Claude Haiku 5.5 Jun 2026.

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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