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Comparison · 2 models · Updated Oct 4, 2026

GPT-5.3 Codex vs Gemini 2.5 Computer Use Preview

GPT-5.3 Codex comes out ahead, 42 to 35 on our weighted score, though Gemini 2.5 Computer Use Preview is 29% cheaper per token.

  1. Our pick

    OpenAI

    GPT-5.3 Codex

    Released Feb 5, 2026

    42/100
    • ECI156.8
    • Price$1.75 / $14.00
    • Context400K
    Full specs Remove GPT-5.3 Codex

  2. Google

    Gemini 2.5 Computer Use Preview

    Released Oct 7, 2025

    35/100
    • ECI—
    • Price$1.25 / $10.00
    • Context128K
    Full specs Remove Gemini 2.5 Computer Use Preview

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

GPT-5.3 Codex is our pick

GPT-5.3 Codex is the better all-round choice, scoring 42/100 against Gemini 2.5 Computer Use Preview (35). It leads on inputs & features and context window. Gemini 2.5 Computer Use Preview wins on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

  • CapabilityNot enough dataNo independent benchmark covers every model here yet
  • Lowest priceGemini 2.5 Computer Use PreviewGemini 2.5 Computer Use Preview $3.44 · GPT-5.3 Codex $4.81 per 1M tokens (3:1 blend)
  • Longest contextGPT-5.3 CodexGPT-5.3 Codex 400,000 · Gemini 2.5 Computer Use Preview 128,000 tokens
  • Widest inputsGPT-5.3 CodexGPT-5.3 Codex: Text, Images, PDFs · Gemini 2.5 Computer Use Preview: Text, Images
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGPT-5.3 CodexGemini 2.5 Computer Use Preview
Price50%1824
Inputs & features30%8060
Context window20%4424
Overall100%42/10035/100

Left out because at least one model lacks the data: capability. The remaining weights were rescaled.

02 — Side by side

Every spec in one table

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

GPT-5.3 Codex vs Gemini 2.5 Computer Use Preview specifications side by side
SpecificationGPT-5.3 CodexOpenAIGemini 2.5 Computer Use PreviewGoogle
Capability
Capabilities Index (ECI)156.8—
ECI rank#18 of 148—
SWE-bench VerifiedFixing real GitHub issues74.8%—
Price per million tokens
Input$1.75$1.25 (best)
Output$14.00$10.00 (best)
Cached input$0.175—
Blended (3:1)$4.81$3.44 (best)
Long-context rateSame rateOver 200K: $2.50 / $15.00
Price sourceOfficial OpenAI APIOfficial Google API
Limits
Context window400,000 tokens (best)128,000 tokens
Max output128,000 tokens (best)64,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesNo
AudioNoNo
VideoNoNo
ReasoningYeslow · medium · high · xhighYes
Tool callingYesYes
Structured outputYesNo
Availability
WeightsProprietaryProprietary
API model IDgpt-5.3-codexgemini-2.5-computer-use-preview-10-2025
API providers19 (best)2
ReleasedFeb 5, 2026Oct 7, 2025
Knowledge cutoffAug 31, 2025Jan 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-5.3 Codex$45.50
  • Gemini 2.5 Computer Use Preview$32.50
04 — Questions

Which should you choose?

Which is better: GPT-5.3 Codex or Gemini 2.5 Computer Use Preview?

GPT-5.3 Codex is the better all-round choice, scoring 42/100 against Gemini 2.5 Computer Use Preview (35). It leads on inputs & features and context window. Gemini 2.5 Computer Use Preview wins on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.

Which is cheaper, GPT-5.3 Codex or Gemini 2.5 Computer Use Preview?

Gemini 2.5 Computer Use Preview is cheaper at $1.25 input / $10.00 output per million tokens (official Google API price). GPT-5.3 Codex costs $1.75 input / $14.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $3.44 per million tokens for Gemini 2.5 Computer Use Preview versus $4.81 for GPT-5.3 Codex (1.4× as much).

Which scores higher on benchmarks?

There is no independent benchmark that covers both models yet. GPT-5.3 Codex has an ECI of 156.8 and Gemini 2.5 Computer Use Preview has not been scored yet.

Which is better for coding?

There are no published SWE-bench Verified results for Gemini 2.5 Computer Use Preview yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.

Which has the bigger context window?

GPT-5.3 Codex has the largest context window at 400,000 tokens, against 128,000 for Gemini 2.5 Computer Use Preview. Maximum output per response: GPT-5.3 Codex up to 128,000, Gemini 2.5 Computer Use Preview up to 64,000 tokens.

Which can read images, PDFs, audio or video?

GPT-5.3 Codex accepts text, images and PDFs; Gemini 2.5 Computer Use Preview accepts text and images. GPT-5.3 Codex handles the widest range of inputs.

Are any of these open source?

No. GPT-5.3 Codex and Gemini 2.5 Computer Use Preview are proprietary and only available through APIs and apps.

Which is newer?

GPT-5.3 Codex is the newest, released Feb 5, 2026. Gemini 2.5 Computer Use Preview came out Oct 7, 2025. Knowledge cutoff: GPT-5.3 Codex Aug 31, 2025, Gemini 2.5 Computer Use Preview Jan 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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