ZMIME
Comparison · 2 models · Updated Oct 4, 2026

o4-mini vs Claude Haiku 4.5

Too close to call on our weighted score (o4-mini 59, Claude Haiku 4.5 58). The right pick depends on what you value most.

  1. OpenAI

    o4-mini

    Released Apr 16, 2025Deprecated

    59/100
    • ECI145.6
    • Price$1.10 / $4.40
    • Context200K
    Full specs Remove o4-mini

  2. 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

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Too close to call

It is close. Our weighted score puts them within a point (o4-mini 59/100, Claude Haiku 4.5 58/100), so choose by what matters most for your work: o4-mini for raw capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • Capabilityo4-miniCapabilities Index (ECI): o4-mini 145.6 · Claude Haiku 4.5 142.4
  • Lowest priceo4-minio4-mini $1.93 · Claude Haiku 4.5 $2.00 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameo4-mini 200,000 · Claude Haiku 4.5 200,000 tokens
  • Widest inputsClaude Haiku 4.5o4-mini: Text, Images · Claude Haiku 4.5: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeighto4-miniClaude Haiku 4.5
CapabilityCapabilities Index (ECI)50%7369
Price25%3636
Inputs & features15%7080
Context window10%3232
Overall100%59/10058/100
02 — Side by side

Every spec in one table

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

o4-mini vs Claude Haiku 4.5 specifications side by side
Specificationo4-miniOpenAIClaude Haiku 4.5Anthropic
Capability
Capabilities Index (ECI)145.6 (best)142.4
ECI rank#76 of 148 (best)#90 of 148
GPQA DiamondGraduate-level science questions79.6% (best)71.2%
FrontierMath Tiers 1–3Research-level mathematics36.1%—
OTIS Mock AIME 2024–2025Competition mathematics81.7% (best)66.7%
SimpleQA VerifiedShort factual questions19.6% (best)13.2%
Price per million tokens
Input$1.10$1.00 (best)
Output$4.40 (best)$5.00
Cached input$0.275$0.10 (best)
Blended (3:1)$1.93 (best)$2.00
Long-context rateSame rateSame rate
Price sourceOfficial OpenAI APIOfficial Anthropic API
Limits
Context window200,000 tokens200,000 tokens
Max output100,000 tokens (best)64,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioNoNo
VideoNoNo
ReasoningYeslow · medium · highYes
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDo4-miniclaude-haiku-4-5
API providers1934 (best)
ReleasedApr 16, 2025Oct 15, 2025
Knowledge cutoffMay 2024Feb 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.

  • o4-mini$19.80
  • Claude Haiku 4.5$20.00
04 — Questions

Which should you choose?

Which is better: o4-mini or Claude Haiku 4.5?

It is close. Our weighted score puts them within a point (o4-mini 59/100, Claude Haiku 4.5 58/100), so choose by what matters most for your work: o4-mini for raw capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, o4-mini or Claude Haiku 4.5?

o4-mini is cheaper at $1.10 input / $4.40 output per million tokens (official OpenAI 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 $1.93 per million tokens for o4-mini versus $2.00 for Claude Haiku 4.5 (1× as much).

Which scores higher on benchmarks?

o4-mini scores higher on the Capabilities Index (ECI): o4-mini 145.6 (#76 of 148) and Claude Haiku 4.5 142.4 (#90 of 148). The confidence ranges of the top two overlap (143.0–147.4 vs 139.5–144.3), so treat the gap as small. On individual benchmarks: GPQA Diamond — o4-mini 79.6%, Claude Haiku 4.5 71.2%; OTIS Mock AIME 2024–2025 — o4-mini 81.7%, Claude Haiku 4.5 66.7%; SimpleQA Verified — o4-mini 19.6%, Claude Haiku 4.5 13.2%.

Which is better for coding?

There are no published SWE-bench Verified results for o4-mini and Claude Haiku 4.5 yet, so there is no like-for-like coding score. On overall capability, o4-mini 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?

o4-mini and Claude Haiku 4.5 share the same 200,000-token context window. Maximum output per response: o4-mini up to 100,000, Claude Haiku 4.5 up to 64,000 tokens.

Which can read images, PDFs, audio or video?

o4-mini accepts text and images; Claude Haiku 4.5 accepts text, images and PDFs. Claude Haiku 4.5 handles the widest range of inputs.

Are any of these open source?

No. o4-mini and Claude Haiku 4.5 are proprietary and only available through APIs and apps.

Which is newer?

Claude Haiku 4.5 is the newest, released Oct 15, 2025. o4-mini came out Apr 16, 2025. Knowledge cutoff: o4-mini May 2024, 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 Oct 4, 2026.

05 — Keep comparing

Related comparisons