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Comparison · 2 models · Updated Nov 2, 2026

GPT-5 Nano vs Claude Haiku 4.5

GPT-5 Nano comes out ahead, 68 to 57 on our weighted score, and it is the cheaper option too.

  1. Our pick

    OpenAI

    GPT-5 Nano

    Released Aug 7, 2025

    68/100
    • ECI139.3
    • Price$0.05 / $0.40
    • Context400K
    Full specs Remove GPT-5 Nano

  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

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

GPT-5 Nano is our pick

GPT-5 Nano is the better all-round choice, scoring 68/100 against Claude Haiku 4.5 (57). It leads on price and context window. Claude Haiku 4.5 wins on capability and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityClaude Haiku 4.5Capabilities Index (ECI): Claude Haiku 4.5 142.2 · GPT-5 Nano 139.3
  • Lowest priceGPT-5 NanoGPT-5 Nano $0.138 · Claude Haiku 4.5 $2.00 per 1M tokens (3:1 blend)
  • Longest contextGPT-5 NanoGPT-5 Nano 400,000 · Claude Haiku 4.5 200,000 tokens
  • Widest inputsClaude Haiku 4.5GPT-5 Nano: Text, Images · Claude Haiku 4.5: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGPT-5 NanoClaude Haiku 4.5
CapabilityCapabilities Index (ECI)50%6367
Price25%8734
Inputs & features15%7080
Context window10%4432
Overall100%68/10057/100
02 — Side by side

Every spec in one table

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

GPT-5 Nano vs Claude Haiku 4.5 specifications side by side
SpecificationGPT-5 NanoOpenAIClaude Haiku 4.5Anthropic
Capability
Capabilities Index (ECI)139.3142.2 (best)
ECI rank#116 of 165#102 of 165 (best)
GPQA DiamondGraduate-level science questions69.4%71.2% (best)
FrontierMath Tiers 1–3Research-level mathematics20.0%—
OTIS Mock AIME 2024–2025Competition mathematics81.1% (best)66.7%
SimpleQA VerifiedShort factual questions11.7%13.2% (best)
Price per million tokens
Input$0.05 (best)$1.00
Output$0.40 (best)$5.00
Cached input$0.005 (best)$0.10
Blended (3:1)$0.138 (best)$2.00
Long-context rateSame rateSame rate
Price sourceOfficial OpenAI APIOfficial Anthropic API
Limits
Context window400,000 tokens (best)200,000 tokens
Max output128,000 tokens (best)64,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioNoNo
VideoNoNo
ReasoningYesminimal · low · medium · highYes
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgpt-5-nanoclaude-haiku-4-5
API providers3048 (best)
ReleasedAug 7, 2025Oct 15, 2025
Knowledge cutoffMay 30, 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.

  • GPT-5 Nano$1.30
  • Claude Haiku 4.5$20.00
04 — Questions

Which should you choose?

Which is better: GPT-5 Nano or Claude Haiku 4.5?

GPT-5 Nano is the better all-round choice, scoring 68/100 against Claude Haiku 4.5 (57). It leads on price and context window. Claude Haiku 4.5 wins on capability and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, GPT-5 Nano or Claude Haiku 4.5?

GPT-5 Nano is cheaper at $0.05 input / $0.40 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 $0.138 per million tokens for GPT-5 Nano versus $2.00 for Claude Haiku 4.5 (15× as much).

Which scores higher on benchmarks?

Claude Haiku 4.5 scores higher on the Capabilities Index (ECI): Claude Haiku 4.5 142.2 (#102 of 165) and GPT-5 Nano 139.3 (#116 of 165). The confidence ranges of the top two overlap (139.4–143.9 vs 134.3–141.5), so treat the gap as small. On individual benchmarks: GPQA Diamond — Claude Haiku 4.5 71.2%, GPT-5 Nano 69.4%; OTIS Mock AIME 2024–2025 — GPT-5 Nano 81.1%, Claude Haiku 4.5 66.7%; SimpleQA Verified — Claude Haiku 4.5 13.2%, GPT-5 Nano 11.7%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-5 Nano and Claude Haiku 4.5 yet, so there is no like-for-like coding score. On overall capability, Claude Haiku 4.5 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?

GPT-5 Nano has the largest context window at 400,000 tokens, against 200,000 for Claude Haiku 4.5. Maximum output per response: GPT-5 Nano up to 128,000, Claude Haiku 4.5 up to 64,000 tokens.

Which can read images, PDFs, audio or video?

GPT-5 Nano 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. GPT-5 Nano 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. GPT-5 Nano came out Aug 7, 2025. Knowledge cutoff: GPT-5 Nano May 30, 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 Nov 2, 2026.

05 — Keep comparing

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