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Comparison · 3 models · Updated Nov 2, 2026

Claude Haiku 5.5 vs GPT-6 Luna vs DeepSeek V4.1 Flash 1017

Too close to call on our weighted score (Claude Haiku 5.5 83, GPT-6 Luna 80, DeepSeek V4.1 Flash 1017 79). The right pick depends on what you value most.

  1. 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. OpenAI

    GPT-6 Luna

    Released Sep 22, 2026New

    80/100
    • ECI156.8
    • Price$0.10 / $0.50
    • Context1.05M
    Full specs Remove GPT-6 Luna

  3. 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
01 — Verdict

Too close to call

It is close. Our weighted score puts them within 2 points (Claude Haiku 5.5 83/100, GPT-6 Luna 80/100, DeepSeek V4.1 Flash 1017 79/100), so choose by what matters most for your work: Claude Haiku 5.5 for raw capability and GPT-6 Luna for long inputs. 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 1017 158.8 · GPT-6 Luna 156.8
  • Lowest priceClaude Haiku 5.5 and GPT-6 LunaClaude Haiku 5.5 $0.20 · GPT-6 Luna $0.20 · DeepSeek V4.1 Flash 1017 $0.263 per 1M tokens (3:1 blend)
  • Longest contextGPT-6 LunaGPT-6 Luna 1,050,000 · Claude Haiku 5.5 1,000,000 · DeepSeek V4.1 Flash 1017 1,000,000 tokens
  • Widest inputsClaude Haiku 5.5 and GPT-6 LunaClaude Haiku 5.5: Text, Images, PDFs · GPT-6 Luna: Text, Images, PDFs · DeepSeek V4.1 Flash 1017: Text, Images
  • Self-hostingDeepSeek V4.1 Flash 1017Publishes downloadable weights (MIT)
How the score is built
MeasureWeightClaude Haiku 5.5GPT-6 LunaDeepSeek V4.1 Flash 1017
CapabilityCapabilities Index (ECI)50%898587
Price25%808074
Inputs & features15%808070
Context window10%606160
Overall100%83/10080/10079/100
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 GPT-6 Luna vs DeepSeek V4.1 Flash 1017 specifications side by side
SpecificationClaude Haiku 5.5AnthropicGPT-6 LunaOpenAIDeepSeek V4.1 Flash 1017DeepSeek
Capability
Capabilities Index (ECI)160.4 (best)156.8158.8
ECI rank#14 of 165 (best)#28 of 165#19 of 165
GPQA DiamondGraduate-level science questions89.7%90.5%93.2% (best)
FrontierMath Tiers 1–3Research-level mathematics75.1%79.0% (best)71.2%
OTIS Mock AIME 2024–2025Competition mathematics98.9%98.9%99.4% (best)
SimpleQA VerifiedShort factual questions23.8%41.4%42.5% (best)
Price per million tokens
Input$0.10 (best)$0.10 (best)$0.15
Output$0.50 (best)$0.50 (best)$0.60
Cached input$0.01$0.01$0.003 (best)
Blended (3:1)$0.20 (best)$0.20 (best)$0.263
Long-context rateOver 100K: $0.50 / $2.50Over 272K: $0.20 / $0.75Same rate
Price sourceOfficial Anthropic APIOfficial OpenAI APIOfficial DeepSeek API
Limits
Context window1,000,000 tokens1,050,000 tokens (best)1,000,000 tokens
Max output128,000 tokens128,000 tokens384,000 tokens (best)
Inputs and features
TextYesYesYes
ImagesYesYesYes
PDFsYesYesNo
AudioNoNoNo
VideoNoNoNo
ReasoningYeslow · medium · high · xhigh · maxYeslow · medium · high · xhigh · maxYeslow · high · max
Tool callingYesYesYes
Structured outputYesYesYes
Availability
WeightsProprietaryProprietaryOpenMIT
API model IDclaude-haiku-5-5gpt-6-lunadeepseek-flash
API providers333540 (best)
ReleasedOct 7, 2026Sep 22, 2026Oct 17, 2026
Knowledge cutoffJun 2026May 18, 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
  • GPT-6 Luna$2.00
  • DeepSeek V4.1 Flash 1017$2.70
04 — Questions

Which should you choose?

Which is better: Claude Haiku 5.5, GPT-6 Luna or DeepSeek V4.1 Flash 1017?

It is close. Our weighted score puts them within 2 points (Claude Haiku 5.5 83/100, GPT-6 Luna 80/100, DeepSeek V4.1 Flash 1017 79/100), so choose by what matters most for your work: Claude Haiku 5.5 for raw capability and GPT-6 Luna for long inputs. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Claude Haiku 5.5, GPT-6 Luna or DeepSeek V4.1 Flash 1017?

Claude Haiku 5.5 is cheaper at $0.10 input / $0.50 output per million tokens (official Anthropic API price). GPT-6 Luna costs $0.10 input / $0.50 output per million tokens (official OpenAI API price); DeepSeek V4.1 Flash 1017 costs $0.15 input / $0.60 output per million tokens (official DeepSeek 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 $0.20 for GPT-6 Luna (1× as much) and $0.263 for DeepSeek V4.1 Flash 1017 (1.3× 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), DeepSeek V4.1 Flash 1017 158.8 (#19 of 165) and GPT-6 Luna 156.8 (#28 of 165). The confidence ranges of the top two overlap (157.3–163.8 vs 156.7–162.2), so treat the gap as small. On individual benchmarks: GPQA Diamond — DeepSeek V4.1 Flash 1017 93.2%, GPT-6 Luna 90.5%, Claude Haiku 5.5 89.7%; FrontierMath Tiers 1–3 — GPT-6 Luna 79.0%, Claude Haiku 5.5 75.1%, DeepSeek V4.1 Flash 1017 71.2%; OTIS Mock AIME 2024–2025 — DeepSeek V4.1 Flash 1017 99.4%, Claude Haiku 5.5 98.9%, GPT-6 Luna 98.9%; SimpleQA Verified — DeepSeek V4.1 Flash 1017 42.5%, GPT-6 Luna 41.4%, Claude Haiku 5.5 23.8%.

Which is better for coding?

There are no published SWE-bench Verified results for Claude Haiku 5.5, GPT-6 Luna and DeepSeek V4.1 Flash 1017 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. All three support tool calling for agent workflows.

Which has the bigger context window?

GPT-6 Luna has the largest context window at 1,050,000 tokens, against 1,000,000 for Claude Haiku 5.5 and 1,000,000 for DeepSeek V4.1 Flash 1017. Maximum output per response: Claude Haiku 5.5 up to 128,000, GPT-6 Luna up to 128,000, DeepSeek V4.1 Flash 1017 up to 384,000 tokens.

Which can read images, PDFs, audio or video?

Claude Haiku 5.5 accepts text, images and PDFs; GPT-6 Luna accepts text, images and PDFs; DeepSeek V4.1 Flash 1017 accepts text and images. Claude Haiku 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 Haiku 5.5 and GPT-6 Luna 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; GPT-6 Luna came out Sep 22, 2026. Knowledge cutoff: Claude Haiku 5.5 Jun 2026, GPT-6 Luna May 18, 2026, DeepSeek V4.1 Flash 1017 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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