Context Window

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Gpt 4o Realtime Preview 2024 12 17 vs Llama 3 1 8b Instant

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.

Openai

Model

Gpt 4o Realtime Preview 2024 12 17

Tool calling

Context window

128K

128,000 tokens · ~96K words

Model page
Meta

Model

Llama 3 1 8b Instant

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.

Gpt 4o Realtime Preview 2024 12 17128K
Llama 3 1 8b Instant128K

Same context window size for both models.

Token calculator →Memory savings →

Gpt 4o Realtime Preview 2024 12 17 and Llama 3 1 8b Instant have identical context windows (128K tokens). Llama 3 1 8b Instant is 99% cheaper on input.

Quick verdicts

Short takeaways — validate with your own workloads.

  • RAG / high-volume retrieval

    Use Llama 3 1 8b Instant. Input tokens are 99% cheaper — critical when sending large retrieved contexts.

  • Long output (reports, code files)

    Use Llama 3 1 8b Instant. Its 8K 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.

SpecGpt 4o Realtime Preview 2024 12 17Llama 3 1 8b Instant
Context window128,000 tokens (128K)128,000 tokens (128K)
Max output tokens4,096 tokens (4K)8,192 tokens (8K)
Speed tierBalancedFast
VisionNoNo
Function callingYesYes
Extended thinkingNoNo
Prompt cachingYesNo
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.

ProviderGpt 4o Realtime Preview 2024 12 17 inGpt 4o Realtime Preview 2024 12 17 outLlama 3 1 8b Instant inLlama 3 1 8b Instant out
Azure$5.50/M$22.00/M——
Groq——$0.050/M$0.080/M
Openai$5.00/M$20.00/M——

Frequently asked questions

Llama 3 1 8b Instant has a larger context window: 128K 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.

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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.

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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