ZMIME
Comparison · 2 models · Updated Oct 4, 2026

Claude Mythos 5 vs Gemma 4 31B IT

Gemma 4 31B IT comes out ahead, 70 to 36 on our weighted score, and it is the cheaper option too.

  1. Anthropic

    Claude Mythos 5

    Released Jun 9, 2026

    36/100
    • ECI—
    • Price$10.00 / $50.00
    • Context1M
    Full specs Remove Claude Mythos 5
  2. Our pick

    Google

    Gemma 4 31B IT

    Released Apr 2, 2026

    70/100
    • ECI142.8
    • Price$0.14 / $0.40
    • Context262K
    Full specs Remove Gemma 4 31B IT

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Gemma 4 31B IT is our pick

Gemma 4 31B IT is the better all-round choice, scoring 70/100 against Claude Mythos 5 (36). It leads on price. Claude Mythos 5 wins on inputs & features and context window. 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 priceGemma 4 31B ITGemma 4 31B IT $0.205 · Claude Mythos 5 $20.00 per 1M tokens (3:1 blend)
  • Longest contextClaude Mythos 5Claude Mythos 5 1,000,000 · Gemma 4 31B IT 262,144 tokens
  • Widest inputsClaude Mythos 5Claude Mythos 5: Text, Images, PDFs · Gemma 4 31B IT: Text, Images
  • Self-hostingGemma 4 31B ITPublishes downloadable weights
How the score is built
MeasureWeightClaude Mythos 5Gemma 4 31B IT
Price50%083
Inputs & features30%8070
Context window20%6037
Overall100%36/10070/100

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.

Claude Mythos 5 vs Gemma 4 31B IT specifications side by side
SpecificationClaude Mythos 5AnthropicGemma 4 31B ITGoogle
Capability
Capabilities Index (ECI)—142.8
ECI rank—#86 of 148
GPQA DiamondGraduate-level science questions—75.8%
OTIS Mock AIME 2024–2025Competition mathematics—73.3%
SimpleQA VerifiedShort factual questions—10.4%
Price per million tokens
Input$10.00$0.14 (best)
Output$50.00$0.40 (best)
Cached input——
Blended (3:1)$20.00$0.205 (best)
Long-context rateSame rateSame rate
Price sourceMedian of 2 providersMedian of 30 providers
Limits
Context window1,000,000 tokens (best)262,144 tokens
Max output128,000 tokens (best)32,768 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesNo
AudioNoNo
VideoNoNo
ReasoningYesYes
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryOpen
API model ID—gemma-4-31b-it
API providers238 (best)
ReleasedJun 9, 2026Apr 2, 2026
Knowledge cutoffJan 31, 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.

  • Claude Mythos 5$200.00
  • Gemma 4 31B IT$2.20
04 — Questions

Which should you choose?

Which is better: Claude Mythos 5 or Gemma 4 31B IT?

Gemma 4 31B IT is the better all-round choice, scoring 70/100 against Claude Mythos 5 (36). It leads on price. Claude Mythos 5 wins on inputs & features and context window. 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, Claude Mythos 5 or Gemma 4 31B IT?

Gemma 4 31B IT is cheaper at $0.14 input / $0.40 output per million tokens (median across 30 API providers). Claude Mythos 5 costs $10.00 input / $50.00 output per million tokens (median across 2 API providers). At a typical mix of three input tokens to one output token, that is $0.205 per million tokens for Gemma 4 31B IT versus $20.00 for Claude Mythos 5 (98× as much).

Which scores higher on benchmarks?

There is no independent benchmark that covers both models yet. Claude Mythos 5 has not been scored yet and Gemma 4 31B IT has an ECI of 142.8.

Which is better for coding?

There are no published SWE-bench Verified results for Claude Mythos 5 and Gemma 4 31B IT 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?

Claude Mythos 5 has the largest context window at 1,000,000 tokens, against 262,144 for Gemma 4 31B IT. Maximum output per response: Claude Mythos 5 up to 128,000, Gemma 4 31B IT up to 32,768 tokens.

Which can read images, PDFs, audio or video?

Claude Mythos 5 accepts text, images and PDFs; Gemma 4 31B IT accepts text and images. Claude Mythos 5 handles the widest range of inputs.

Are any of these open source?

Gemma 4 31B IT publishes its weights and can be self-hosted; Claude Mythos 5 is proprietary.

Which is newer?

Claude Mythos 5 is the newest, released Jun 9, 2026. Gemma 4 31B IT came out Apr 2, 2026. Knowledge cutoff: Claude Mythos 5 Jan 31, 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