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Comparison · 3 models · Updated Oct 4, 2026

GPT-5 Pro vs GPT-5.4 Pro vs Claude Opus 4.5

GPT-5.4 Pro comes out ahead, 60 to 55 and 54 on our weighted score, though Claude Opus 4.5 is 6.8× cheaper per token.

  1. OpenAI

    GPT-5 Pro

    Released Oct 6, 2025

    54/100
    • ECI150.3
    • Price$15.00 / $120.00
    • Context400K
    Full specs Remove GPT-5 Pro
  2. Our pick

    OpenAI

    GPT-5.4 Pro

    Released Mar 5, 2026

    60/100
    • ECI159.1
    • Price$30.00 / $180.00
    • Context1.05M
    Full specs Remove GPT-5.4 Pro

  3. Anthropic

    Claude Opus 4.5

    Released Nov 24, 2025

    55/100
    • ECI150.1
    • Price$5.00 / $25.00
    • Context200K
    Full specs Remove Claude Opus 4.5
01 — Verdict

GPT-5.4 Pro is our pick

GPT-5.4 Pro is the better all-round choice, scoring 60/100 against Claude Opus 4.5 (55) and GPT-5 Pro (54). It leads on capability and context window. Claude Opus 4.5 wins on price and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGPT-5.4 ProCapabilities Index (ECI): GPT-5.4 Pro 159.1 · GPT-5 Pro 150.3 · Claude Opus 4.5 150.1
  • Lowest priceClaude Opus 4.5Claude Opus 4.5 $10.00 · GPT-5 Pro $41.25 · GPT-5.4 Pro $67.50 per 1M tokens (3:1 blend)
  • Longest contextGPT-5.4 ProGPT-5.4 Pro 1,050,000 · GPT-5 Pro 400,000 · Claude Opus 4.5 200,000 tokens
  • Widest inputsClaude Opus 4.5GPT-5 Pro: Text, Images · GPT-5.4 Pro: Text, Images · Claude Opus 4.5: Text, Images, PDFs
  • Self-hostingNo open weightsAll three are available only through APIs
How the score is built
MeasureWeightGPT-5 ProGPT-5.4 ProClaude Opus 4.5
CapabilityCapabilities Index (ECI)50%789078
Price25%002
Inputs & features15%706080
Context window10%446132
Overall100%54/10060/10055/100
02 — Side by side

Every spec in one table

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

GPT-5 Pro vs GPT-5.4 Pro vs Claude Opus 4.5 specifications side by side
SpecificationGPT-5 ProOpenAIGPT-5.4 ProOpenAIClaude Opus 4.5Anthropic
Capability
Capabilities Index (ECI)150.3159.1 (best)150.1
ECI rank#46 of 148#11 of 148 (best)#48 of 148
GPQA DiamondGraduate-level science questions—94.6% (best)86.1%
FrontierMath Tiers 1–3Research-level mathematics55.8%82.5% (best)34.4%
OTIS Mock AIME 2024–2025Competition mathematics——86.1%
SWE-bench VerifiedFixing real GitHub issues——76.7%
SimpleQA VerifiedShort factual questions—46.3% (best)45.7%
Price per million tokens
Input$15.00$30.00$5.00 (best)
Output$120.00$180.00$25.00 (best)
Cached input——$0.50
Blended (3:1)$41.25$67.50$10.00 (best)
Long-context rateSame rateOver 272K: $60.00 / $270.00Same rate
Price sourceOfficial OpenAI APIOfficial OpenAI APIOfficial Anthropic API
Limits
Context window400,000 tokens1,050,000 tokens (best)200,000 tokens
Max output272,000 tokens (best)128,000 tokens64,000 tokens
Inputs and features
TextYesYesYes
ImagesYesYesYes
PDFsNoNoYes
AudioNoNoNo
VideoNoNoNo
ReasoningYeshighYesmedium · high · xhighYeslow · medium · high
Tool callingYesYesYes
Structured outputYesNoYes
Availability
WeightsProprietaryProprietaryProprietary
API model IDgpt-5-progpt-5.4-proclaude-opus-4-5
API providers121628 (best)
ReleasedOct 6, 2025Mar 5, 2026Nov 24, 2025
Knowledge cutoffSep 30, 2024Aug 31, 2025May 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 Pro$390.00
  • GPT-5.4 Pro$660.00
  • Claude Opus 4.5$100.00
04 — Questions

Which should you choose?

Which is better: GPT-5 Pro, GPT-5.4 Pro or Claude Opus 4.5?

GPT-5.4 Pro is the better all-round choice, scoring 60/100 against Claude Opus 4.5 (55) and GPT-5 Pro (54). It leads on capability and context window. Claude Opus 4.5 wins on price and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, GPT-5 Pro, GPT-5.4 Pro or Claude Opus 4.5?

Claude Opus 4.5 is cheaper at $5.00 input / $25.00 output per million tokens (official Anthropic API price). GPT-5 Pro costs $15.00 input / $120.00 output per million tokens (official OpenAI API price); GPT-5.4 Pro costs $30.00 input / $180.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $10.00 per million tokens for Claude Opus 4.5 versus $41.25 for GPT-5 Pro (4.1× as much) and $67.50 for GPT-5.4 Pro (6.8× as much).

Which scores higher on benchmarks?

GPT-5.4 Pro scores higher on the Capabilities Index (ECI): GPT-5.4 Pro 159.1 (#11 of 148), GPT-5 Pro 150.3 (#46 of 148) and Claude Opus 4.5 150.1 (#48 of 148). Their confidence ranges do not overlap (156.5–161.9 vs 148.5–152.8), so the gap is a real one. On individual benchmarks: FrontierMath Tiers 1–3 — GPT-5.4 Pro 82.5%, GPT-5 Pro 55.8%, Claude Opus 4.5 34.4%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-5 Pro and GPT-5.4 Pro yet, so there is no like-for-like coding score. On overall capability, GPT-5.4 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?

GPT-5.4 Pro has the largest context window at 1,050,000 tokens, against 400,000 for GPT-5 Pro and 200,000 for Claude Opus 4.5. Maximum output per response: GPT-5 Pro up to 272,000, GPT-5.4 Pro up to 128,000, Claude Opus 4.5 up to 64,000 tokens.

Which can read images, PDFs, audio or video?

GPT-5 Pro accepts text and images; GPT-5.4 Pro accepts text and images; Claude Opus 4.5 accepts text, images and PDFs. Claude Opus 4.5 handles the widest range of inputs.

Are any of these open source?

No. GPT-5 Pro, GPT-5.4 Pro and Claude Opus 4.5 are proprietary and only available through APIs and apps.

Which is newer?

GPT-5.4 Pro is the newest, released Mar 5, 2026. Claude Opus 4.5 came out Nov 24, 2025; GPT-5 Pro came out Oct 6, 2025. Knowledge cutoff: GPT-5 Pro Sep 30, 2024, GPT-5.4 Pro Aug 31, 2025, Claude Opus 4.5 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 Oct 4, 2026.

05 — Keep comparing

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