Context Window

Compare

Claude Mythos Preview vs Meta Llama3 1 405b Instruct

This page is context-first: how much text each model can take in one request. Full specs adds capabilities and limits; the pricing matrix below is only about $/million tokens from hosts that list both models.

Anthropic

Model

Claude Mythos Preview

Image inputTool calling

Context window

1M

1,000,000 tokens · ~750K words

Model page
Meta

Model

Meta Llama3 1 405b Instruct

Tool calling

Context window

128K

128,000 tokens · ~96K words

Model page

Context window · side by side

Bar length is relative to the larger of the two windows (100% = max of this pair). This is not pricing.

Claude Mythos Preview1M
Meta Llama3 1 405b Instruct128K

Claude Mythos Preview has about 7.8× the context window of the other in this pair.

Token calculator →Memory savings →

Claude Mythos Preview has 681% more context capacity (1000K vs 128K tokens).

Quick verdicts

Short takeaways — validate with your own workloads.

  • Long document processing

    Use Claude Mythos Preview. Its 1000K context fits entire documents without chunking (vs 128K).

  • Long output (reports, code files)

    Use Claude Mythos Preview. Its 128K max output lets you generate complete artifacts in one request.

Full specs

Context, output, capabilities, and dates. Green highlights the favorable value where we compute a winner.

SpecClaude Mythos PreviewMeta Llama3 1 405b Instruct
Context window1,000,000 tokens (1000K)128,000 tokens (128K)
Max output tokens128,000 tokens (128K)4,096 tokens (4K)
Speed tierBalancedDeep
VisionYesNo
Function callingYesYes
Extended thinkingYesNo
Prompt cachingNoNo
Batch APIYesNo
Release dateN/AN/A

Pricing matrix

Dollar rates only: hosts that list both models, per 1M tokens. For how much text fits, use the context section above — not this table.

ProviderClaude Mythos Preview inClaude Mythos Preview outMeta Llama3 1 405b Instruct inMeta Llama3 1 405b Instruct out
Aws Bedrock——$5.32/M$16.00/M

Frequently asked questions

Claude Mythos Preview has a larger context window: 1000K tokens vs 128K. For long documents, large codebases, or extended agent sessions, the larger context window reduces the need to chunk inputs or summarize history.

Powered by Mem0

Use a smaller model.
Get better results.

Mem0 gives your AI long-term memory so you stop re-sending context on every call. That means you can use a smaller, faster, cheaper model — and still get better answers.

Calculate your savingsLearn about Mem0

Example: a multi-turn chat session

Without Mem0~128K tokens sent
Full history
Repeated info
Old context
With Mem0~20K tokens sent
Key memories
Current turn

80% less to send — works with any model