ZMIME
Comparison · 2 models · Updated Oct 4, 2026

GPT-5.4 mini vs Claude Opus 5

Too close to call on our weighted score (Claude Opus 5 66, GPT-5.4 mini 63). The right pick depends on what you value most.

  1. OpenAI

    GPT-5.4 mini

    Released Mar 17, 2026

    63/100
    • ECI148.8
    • Price$0.75 / $4.50
    • Context400K
    Full specs Remove GPT-5.4 mini

  2. Anthropic

    Claude Opus 5

    Released Jul 24, 2026

    66/100
    • ECI162.9
    • Price$5.00 / $25.00
    • Context1M
    Full specs Remove Claude Opus 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 3 points (Claude Opus 5 66/100, GPT-5.4 mini 63/100), so choose by what matters most for your work: Claude Opus 5 for raw capability and GPT-5.4 mini on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityClaude Opus 5Capabilities Index (ECI): Claude Opus 5 162.9 · GPT-5.4 mini 148.8
  • Lowest priceGPT-5.4 miniGPT-5.4 mini $1.69 · Claude Opus 5 $10.00 per 1M tokens (3:1 blend)
  • Longest contextClaude Opus 5Claude Opus 5 1,000,000 · GPT-5.4 mini 400,000 tokens
  • Widest inputsClaude Opus 5GPT-5.4 mini: Text, Images · Claude Opus 5: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGPT-5.4 miniClaude Opus 5
CapabilityCapabilities Index (ECI)50%7794
Price25%392
Inputs & features15%7080
Context window10%4460
Overall100%63/10066/100
02 — Side by side

Every spec in one table

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

GPT-5.4 mini vs Claude Opus 5 specifications side by side
SpecificationGPT-5.4 miniOpenAIClaude Opus 5Anthropic
Capability
Capabilities Index (ECI)148.8162.9 (best)
ECI rank#56 of 148#5 of 148 (best)
GPQA DiamondGraduate-level science questions86.9%93.9% (best)
FrontierMath Tiers 1–3Research-level mathematics51.2%85.6% (best)
OTIS Mock AIME 2024–2025Competition mathematics88.9%98.9% (best)
SimpleQA VerifiedShort factual questions29.4%59.9% (best)
Price per million tokens
Input$0.75 (best)$5.00
Output$4.50 (best)$25.00
Cached input$0.075 (best)$0.50
Blended (3:1)$1.69 (best)$10.00
Long-context rateSame rateSame rate
Price sourceOfficial OpenAI APIOfficial Anthropic API
Limits
Context window400,000 tokens1,000,000 tokens (best)
Max output128,000 tokens128,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsNoYes
AudioNoNo
VideoNoNo
ReasoningYeslow · medium · high · xhighYeslow · medium · high · xhigh · max
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgpt-5.4-miniclaude-opus-5
API providers2935 (best)
ReleasedMar 17, 2026Jul 24, 2026
Knowledge cutoffAug 31, 2025May 2026
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-5.4 mini$16.50
  • Claude Opus 5$100.00
04 — Questions

Which should you choose?

Which is better: GPT-5.4 mini or Claude Opus 5?

It is close. Our weighted score puts them within 3 points (Claude Opus 5 66/100, GPT-5.4 mini 63/100), so choose by what matters most for your work: Claude Opus 5 for raw capability and GPT-5.4 mini on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

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

GPT-5.4 mini is cheaper at $0.75 input / $4.50 output per million tokens (official OpenAI API price). Claude Opus 5 costs $5.00 input / $25.00 output per million tokens (official Anthropic API price). At a typical mix of three input tokens to one output token, that is $1.69 per million tokens for GPT-5.4 mini versus $10.00 for Claude Opus 5 (5.9× as much).

Which scores higher on benchmarks?

Claude Opus 5 scores higher on the Capabilities Index (ECI): Claude Opus 5 162.9 (#5 of 148) and GPT-5.4 mini 148.8 (#56 of 148). Their confidence ranges do not overlap (160.2–166.7 vs 147.1–150.5), so the gap is a real one. On individual benchmarks: GPQA Diamond — Claude Opus 5 93.9%, GPT-5.4 mini 86.9%; FrontierMath Tiers 1–3 — Claude Opus 5 85.6%, GPT-5.4 mini 51.2%; OTIS Mock AIME 2024–2025 — Claude Opus 5 98.9%, GPT-5.4 mini 88.9%; SimpleQA Verified — Claude Opus 5 59.9%, GPT-5.4 mini 29.4%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-5.4 mini and Claude Opus 5 yet, so there is no like-for-like coding score. On overall capability, Claude Opus 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 Opus 5 has the largest context window at 1,000,000 tokens, against 400,000 for GPT-5.4 mini. Maximum output per response: GPT-5.4 mini up to 128,000, Claude Opus 5 up to 128,000 tokens.

Which can read images, PDFs, audio or video?

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

Are any of these open source?

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

Which is newer?

Claude Opus 5 is the newest, released Jul 24, 2026. GPT-5.4 mini came out Mar 17, 2026. Knowledge cutoff: GPT-5.4 mini Aug 31, 2025, Claude Opus 5 May 2026.

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