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Comparison · 3 models · Updated Oct 4, 2026

Claude Haiku 4.5 vs o3-pro vs Claude Opus 4

Claude Haiku 4.5 comes out ahead, 58 to 51 and 48 on our weighted score, and it is the cheaper option too.

  1. Our pick

    Anthropic

    Claude Haiku 4.5

    Released Oct 15, 2025

    58/100
    • ECI142.4
    • Price$1.00 / $5.00
    • Context200K
    Full specs Remove Claude Haiku 4.5

  2. OpenAI

    o3-pro

    Released Jun 10, 2025

    51/100
    • ECI147.4
    • Price$20.00 / $80.00
    • Context200K
    Full specs Remove o3-pro

  3. Anthropic

    Claude Opus 4

    Released May 22, 2025

    48/100
    • ECI142.7
    • Price$15.00 / $75.00
    • Context200K
    Full specs Remove Claude Opus 4
01 — Verdict

Claude Haiku 4.5 is our pick

Claude Haiku 4.5 is the better all-round choice, scoring 58/100 against o3-pro (51) and Claude Opus 4 (48). It leads on price and inputs & features. o3-pro wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • Capabilityo3-proCapabilities Index (ECI): o3-pro 147.4 · Claude Opus 4 142.7 · Claude Haiku 4.5 142.4
  • Lowest priceClaude Haiku 4.5Claude Haiku 4.5 $2.00 · Claude Opus 4 $30.00 · o3-pro $35.00 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameClaude Haiku 4.5 200,000 · o3-pro 200,000 · Claude Opus 4 200,000 tokens
  • Widest inputsClaude Haiku 4.5 and Claude Opus 4Claude Haiku 4.5: Text, Images, PDFs · o3-pro: Text, Images · Claude Opus 4: Text, Images, PDFs
  • Self-hostingNo open weightsAll three are available only through APIs
How the score is built
MeasureWeightClaude Haiku 4.5o3-proClaude Opus 4
CapabilityCapabilities Index (ECI)50%697569
Price25%3600
Inputs & features15%807070
Context window10%323232
Overall100%58/10051/10048/100
02 — Side by side

Every spec in one table

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

Claude Haiku 4.5 vs o3-pro vs Claude Opus 4 specifications side by side
SpecificationClaude Haiku 4.5Anthropico3-proOpenAIClaude Opus 4Anthropic
Capability
Capabilities Index (ECI)142.4147.4 (best)142.7
ECI rank#90 of 148#60 of 148 (best)#87 of 148
GPQA DiamondGraduate-level science questions71.2%—76.3% (best)
OTIS Mock AIME 2024–2025Competition mathematics66.7% (best)—64.4%
SWE-bench VerifiedFixing real GitHub issues——70.7%
SimpleQA VerifiedShort factual questions13.2%——
Price per million tokens
Input$1.00 (best)$20.00$15.00
Output$5.00 (best)$80.00$75.00
Cached input$0.10——
Blended (3:1)$2.00 (best)$35.00$30.00
Long-context rateSame rateSame rateSame rate
Price sourceOfficial Anthropic APIOfficial OpenAI APIMedian of 5 providers
Limits
Context window200,000 tokens200,000 tokens200,000 tokens
Max output64,000 tokens100,000 tokens (best)32,000 tokens
Inputs and features
TextYesYesYes
ImagesYesYesYes
PDFsYesNoYes
AudioNoNoNo
VideoNoNoNo
ReasoningYesYeslow · medium · highYes
Tool callingYesYesYes
Structured outputYesYesNo
Availability
WeightsProprietaryProprietaryProprietary
API model IDclaude-haiku-4-5o3-pro—
API providers34 (best)65
ReleasedOct 15, 2025Jun 10, 2025May 22, 2025
Knowledge cutoffFeb 28, 2025May 2024Mar 31, 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 4.5$20.00
  • o3-pro$360.00
  • Claude Opus 4$300.00
04 — Questions

Which should you choose?

Which is better: Claude Haiku 4.5, o3-pro or Claude Opus 4?

Claude Haiku 4.5 is the better all-round choice, scoring 58/100 against o3-pro (51) and Claude Opus 4 (48). It leads on price and inputs & features. o3-pro wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Claude Haiku 4.5, o3-pro or Claude Opus 4?

Claude Haiku 4.5 is cheaper at $1.00 input / $5.00 output per million tokens (official Anthropic API price). Claude Opus 4 costs $15.00 input / $75.00 output per million tokens (median across 5 API providers); o3-pro costs $20.00 input / $80.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $2.00 per million tokens for Claude Haiku 4.5 versus $30.00 for Claude Opus 4 (15× as much) and $35.00 for o3-pro (18× as much).

Which scores higher on benchmarks?

o3-pro scores higher on the Capabilities Index (ECI): o3-pro 147.4 (#60 of 148), Claude Opus 4 142.7 (#87 of 148) and Claude Haiku 4.5 142.4 (#90 of 148). Their confidence ranges do not overlap (145.8–149.7 vs 140.2–144.2), so the gap is a real one.

Which is better for coding?

There are no published SWE-bench Verified results for Claude Haiku 4.5 and o3-pro yet, so there is no like-for-like coding score. On overall capability, o3-pro 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?

Claude Haiku 4.5, o3-pro and Claude Opus 4 share the same 200,000-token context window. Maximum output per response: Claude Haiku 4.5 up to 64,000, o3-pro up to 100,000, Claude Opus 4 up to 32,000 tokens.

Which can read images, PDFs, audio or video?

Claude Haiku 4.5 accepts text, images and PDFs; o3-pro accepts text and images; Claude Opus 4 accepts text, images and PDFs. Claude Haiku 4.5 handles the widest range of inputs.

Are any of these open source?

No. Claude Haiku 4.5, o3-pro and Claude Opus 4 are proprietary and only available through APIs and apps.

Which is newer?

Claude Haiku 4.5 is the newest, released Oct 15, 2025. o3-pro came out Jun 10, 2025; Claude Opus 4 came out May 22, 2025. Knowledge cutoff: Claude Haiku 4.5 Feb 28, 2025, o3-pro May 2024, Claude Opus 4 Mar 31, 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 Oct 4, 2026.

05 — Keep comparing

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