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Comparison · 2 models · Updated Nov 2, 2026

Claude Haiku 5.5 vs Claude Haiku 4.5

Claude Haiku 5.5 comes out ahead, 83 to 57 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. Anthropic

    Claude Haiku 4.5

    Released Oct 15, 2025

    57/100
    • ECI142.2
    • Price$1.00 / $5.00
    • Context200K
    Full specs Remove Claude Haiku 4.5

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    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 Claude Haiku 4.5 (57). It leads on capability, price and context window. 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 · Claude Haiku 4.5 142.2
  • Lowest priceClaude Haiku 5.5Claude Haiku 5.5 $0.20 · Claude Haiku 4.5 $2.00 per 1M tokens (3:1 blend)
  • Longest contextClaude Haiku 5.5Claude Haiku 5.5 1,000,000 · Claude Haiku 4.5 200,000 tokens
  • Widest inputsSame inputsClaude Haiku 5.5: Text, Images, PDFs · Claude Haiku 4.5: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightClaude Haiku 5.5Claude Haiku 4.5
CapabilityCapabilities Index (ECI)50%8967
Price25%8034
Inputs & features15%8080
Context window10%6032
Overall100%83/10057/100
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 Claude Haiku 4.5 specifications side by side
SpecificationClaude Haiku 5.5AnthropicClaude Haiku 4.5Anthropic
Capability
Capabilities Index (ECI)160.4 (best)142.2
ECI rank#14 of 165 (best)#102 of 165
GPQA DiamondGraduate-level science questions89.7% (best)71.2%
FrontierMath Tiers 1–3Research-level mathematics75.1%—
OTIS Mock AIME 2024–2025Competition mathematics98.9% (best)66.7%
SimpleQA VerifiedShort factual questions23.8% (best)13.2%
Price per million tokens
Input$0.10 (best)$1.00
Output$0.50 (best)$5.00
Cached input$0.01 (best)$0.10
Blended (3:1)$0.20 (best)$2.00
Long-context rateOver 100K: $0.50 / $2.50Same rate
Price sourceOfficial Anthropic APIOfficial Anthropic API
Limits
Context window1,000,000 tokens (best)200,000 tokens
Max output128,000 tokens (best)64,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesYes
AudioNoNo
VideoNoNo
ReasoningYeslow · medium · high · xhigh · maxYes
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDclaude-haiku-5-5claude-haiku-4-5
API providers3348 (best)
ReleasedOct 7, 2026Oct 15, 2025
Knowledge cutoffJun 2026Feb 28, 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
  • Claude Haiku 4.5$20.00
04 — Questions

Which should you choose?

Which is better: Claude Haiku 5.5 or Claude Haiku 4.5?

Claude Haiku 5.5 is the better all-round choice, scoring 83/100 against Claude Haiku 4.5 (57). It leads on capability, price and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Claude Haiku 5.5 or Claude Haiku 4.5?

Claude Haiku 5.5 is cheaper at $0.10 input / $0.50 output per million tokens (official Anthropic API price). Claude Haiku 4.5 costs $1.00 input / $5.00 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 $2.00 for Claude Haiku 4.5 (10× 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 Claude Haiku 4.5 142.2 (#102 of 165). Their confidence ranges do not overlap (157.3–163.8 vs 139.4–143.9), so the gap is a real one. On individual benchmarks: GPQA Diamond — Claude Haiku 5.5 89.7%, Claude Haiku 4.5 71.2%; OTIS Mock AIME 2024–2025 — Claude Haiku 5.5 98.9%, Claude Haiku 4.5 66.7%; SimpleQA Verified — Claude Haiku 5.5 23.8%, Claude Haiku 4.5 13.2%.

Which is better for coding?

There are no published SWE-bench Verified results for Claude Haiku 5.5 and Claude Haiku 4.5 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 has the largest context window at 1,000,000 tokens, against 200,000 for Claude Haiku 4.5. Maximum output per response: Claude Haiku 5.5 up to 128,000, Claude Haiku 4.5 up to 64,000 tokens.

Which can read images, PDFs, audio or video?

Claude Haiku 5.5 accepts text, images and PDFs; Claude Haiku 4.5 accepts text, images and PDFs. They handle the same number of input types.

Are any of these open source?

No. Claude Haiku 5.5 and Claude Haiku 4.5 are proprietary and only available through APIs and apps.

Which is newer?

Claude Haiku 5.5 is the newest, released Oct 7, 2026. Claude Haiku 4.5 came out Oct 15, 2025. Knowledge cutoff: Claude Haiku 5.5 Jun 2026, Claude Haiku 4.5 Feb 28, 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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