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Model Comparison

Gemini 2.5 Flash Lite vs Gemini 4 CarbonWhich Is Better in 2026?

Google: Gemini 2.5 Flash Lite logoGoogle•Google: Gemini 4 Carbon logoGoogle

Gemini 2.5 Flash Lite vs Gemini 4 Carbon: which should you choose in 2026?

Gemini 2.5 Flash Lite (by Google) and Gemini 4 Carbon (by Google) are compared below. Here is how they stack up on benchmarks, price, and capabilities, and which one to pick in 2026.

There are not enough shared, protocol-compatible benchmark results to declare a performance leader.

Gemini 2.5 Flash Lite is about 22.9× cheaper on a blended 3:1 input/output basis ($0.175 vs $4.00 per 1M tokens).

Choose Gemini 2.5 Flash Lite if…

  • • lower blended API cost matters for your workload

Choose Gemini 4 Carbon if…

  • • your own prompt tests favor its output; shared comparable evidence does not identify a unique advantage

The benchmark count includes only results measured with a matching benchmark version and protocol. Arena scores are shown separately. Missing, preliminary, and incompatible data is not treated as a controlled win. Published point-score comparisons are labeled separately when protocol details are incomplete. For text-output models, the verdict also compares token pricing and context windows.

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Performance benchmarks

Every value links to its source. A dash means that no reviewed result is available for that exact model and protocol.

Gemini 2.5 Flash Lite and Gemini 4 Carbon benchmark results
BenchmarkGemini 2.5 Flash LiteGemini 4 Carbon
AutomationBench-AA

A 657-task benchmark of multi-step work across simulated SaaS applications in six business domains. The Artificial Analysis protocol reports a guardrail-aware score and is distinct from both the public Zapier split and the unrelated dynamic AutoBench framework.

Guardrail-aware score

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BrowseComp

A benchmark of difficult, verifiable information-seeking questions designed to measure an agent's ability to locate hard-to-find facts through web browsing.

Accuracy

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OSWorld-Verified

A verified computer-use benchmark in which multimodal agents operate desktop applications and are graded from the resulting environment state.

Mean task reward

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SWE-Bench Verified

A human-validated subset of real GitHub issues used to measure whether a coding agent can produce repository patches that resolve the associated tests.

Resolved

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Terminal-Bench 2.1

Version 2.1 of the benchmark for completing realistic tasks in terminal environments. Harness, resource limits, and attempt count are part of the protocol.

Mean task success

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AutoBench

A dynamic LLM evaluation framework in which models generate questions, answer them, and participate in reciprocal peer assessment. AutoBench is distinct from Zapier's AutomationBench.

Weighted peer-assessment score

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GPQA Diamond

The highest-quality subset of Graduate-Level Google-Proof Q&A, designed to test expert-level scientific reasoning in biology, physics, and chemistry.

Accuracy

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Humanity's Last Exam

A 2,500-question expert-level benchmark spanning dozens of academic fields. Tool-assisted and no-tools results are separate protocols and must not be merged.

Accuracy

——

Benchmark sources

    Reviewed evidence last updated 2026-08-09.

    Pricing, capabilities, and model facts

    Gemini 2.5 Flash Lite and Gemini 4 Carbon model facts
    FeatureGemini 2.5 Flash LiteGemini 4 Carbon
    Context & model facts
    DeveloperGoogleGoogle
    API providerGoogleGoogle
    Input context1,048,576 tokens1,048,576 tokens
    Maximum output65,535 tokens943,718 tokens
    Released——
    Added to WritingmateJul 22, 2025Nov 10, 2026
    LicenseNot availableNot available
    Knowledge cutoff2025-01-31—
    Capabilities
    InputsText, Image, File, Audio, VideoAudio, File, Image, Text, Video
    OutputsTextText
    Provider endpoint accepts tool parametersYesYes
    ReasoningYesYes
    VisionYesYes
    Image GenerationNoNo
    Video GenerationNoNo
    API pricing
    Input (per 1M tokens)$0.10$2.00
    Output (per 1M tokens)$0.40$10.00
    Blended 3:1 input/output$0.175$4.00
    API performance
    p95 latencyNot measuredNot measured
    Output throughputNot measuredNot measured
    Writingmate shows API performance only when both models have enough observations from the same measurement window, prompt profile, and provider. Third-party latency values are not copied into this table.

    Data sources

    • Writingmate model catalog (pricing, limits, and availability)

    Catalog data last updated Nov 10, 2026.

    Gemini 2.5 Flash Lite vs Gemini 4 Carbon FAQ

    Which is better, Gemini 2.5 Flash Lite or Gemini 4 Carbon?

    There are not enough shared, protocol-compatible benchmark results to declare a performance leader. Gemini 2.5 Flash Lite is about 22.9× cheaper on a blended 3:1 input/output basis ($0.175 vs $4.00 per 1M tokens).

    Which model is cheaper to use through an API?

    Gemini 2.5 Flash Lite is about 22.9× cheaper on a blended 3:1 input/output basis ($0.175 vs $4.00 per 1M tokens).

    Which model supports more context?

    The published context windows are close enough that this page does not treat the difference as a material advantage.

    Can I switch between Gemini 2.5 Flash Lite and Gemini 4 Carbon?

    Yes. Use the model selector on this page to open any current Writingmate model comparison. You can also run the same prompt with both models in Writingmate.