ZMIME
Comparison · 2 models · Updated Nov 2, 2026

Granite 4.2 8B vs Claude Mythos 5

Granite 4.2 8B comes out ahead, 64 to 33 on our weighted score, and it is the cheaper option too.

  1. Our pick

    IBM

    Granite 4.2 8B

    Released Aug 25, 2026

    64/100
    • ECI—
    • Price$0.06 / $0.15
    • Context131K
    Full specs Remove Granite 4.2 8B

  2. Anthropic

    Claude Mythos 5

    Released Jun 9, 2026

    33/100
    • ECI—
    • Price$10.00 / $50.00
    • Context1M
    Full specs Remove Claude Mythos 5

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Granite 4.2 8B is our pick

Granite 4.2 8B is the better all-round choice, scoring 64/100 against Claude Mythos 5 (33). 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 priceGranite 4.2 8BGranite 4.2 8B $0.083 · Claude Mythos 5 $20.00 per 1M tokens (3:1 blend)
  • Longest contextClaude Mythos 5Claude Mythos 5 1,000,000 · Granite 4.2 8B 131,072 tokens
  • Widest inputsClaude Mythos 5Granite 4.2 8B: Text · Claude Mythos 5: Text, Images, PDFs
  • Self-hostingGranite 4.2 8BPublishes downloadable weights
How the score is built
MeasureWeightGranite 4.2 8BClaude Mythos 5
Price50%970
Inputs & features30%3570
Context window20%2560
Overall100%64/10033/100

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.

Granite 4.2 8B vs Claude Mythos 5 specifications side by side
SpecificationGranite 4.2 8BIBMClaude Mythos 5Anthropic
Capability
Capabilities Index (ECI)——
ECI rank——
Price per million tokens
Input$0.06 (best)$10.00
Output$0.15 (best)$50.00
Cached input——
Blended (3:1)$0.083 (best)$20.00
Long-context rateSame rateSame rate
Price sourceMedian of 7 providersMedian of 2 providers
Limits
Context window131,072 tokens1,000,000 tokens (best)
Max output117,964 tokens128,000 tokens (best)
Inputs and features
TextYesYes
ImagesNoYes
PDFsNoYes
AudioNoNo
VideoNoNo
ReasoningYesYes
Tool callingYesYes
Structured outputNoNo
Availability
WeightsOpenProprietary
API model ID——
API providers7 (best)2
ReleasedAug 25, 2026Jun 9, 2026
Knowledge cutoff—Jan 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.

  • Granite 4.2 8B$0.90
  • Claude Mythos 5$200.00
04 — Questions

Which should you choose?

Which is better: Granite 4.2 8B or Claude Mythos 5?

Granite 4.2 8B is the better all-round choice, scoring 64/100 against Claude Mythos 5 (33). 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, Granite 4.2 8B or Claude Mythos 5?

Granite 4.2 8B is cheaper at $0.06 input / $0.15 output per million tokens (median across 7 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 $0.083 per million tokens for Granite 4.2 8B versus $20.00 for Claude Mythos 5 (242× as much).

Which scores higher on benchmarks?

There is no independent benchmark that covers both models yet. Granite 4.2 8B has not been scored yet and Claude Mythos 5 has not been scored yet.

Which is better for coding?

There are no published SWE-bench Verified results for Granite 4.2 8B and Claude Mythos 5 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 131,072 for Granite 4.2 8B. Maximum output per response: Granite 4.2 8B up to 117,964, Claude Mythos 5 up to 128,000 tokens.

Which can read images, PDFs, audio or video?

Granite 4.2 8B accepts text; Claude Mythos 5 accepts text, images and PDFs. Claude Mythos 5 handles the widest range of inputs.

Are any of these open source?

Granite 4.2 8B publishes its weights and can be self-hosted; Claude Mythos 5 is proprietary.

Which is newer?

Granite 4.2 8B is the newest, released Aug 25, 2026. Claude Mythos 5 came out Jun 9, 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 Nov 2, 2026.

05 — Keep comparing

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