Context Window

Compare

Gpt 35 Turbo Instruct 0914 vs Grok Code Fast

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 35 Turbo Instruct 0914

Context window

4K

4,097 tokens · ~3K words

Model page
Xai

Model

Grok Code Fast

Tool calling

Context window

256K

256,000 tokens · ~192K 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 35 Turbo Instruct 09144K
Grok Code Fast256K

Grok Code Fast has about 62.5× the context window of the other in this pair.

Token calculator →Memory savings →

Grok Code Fast has 6148% more context capacity (256K vs 4K tokens). Grok Code Fast is 86% cheaper on input.

Quick verdicts

Short takeaways — validate with your own workloads.

  • Long document processing

    Use Grok Code Fast. Its 256K context fits entire documents without chunking (vs 4K).

  • RAG / high-volume retrieval

    Use Grok Code Fast. Input tokens are 86% cheaper — critical when sending large retrieved contexts.

Full specs

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

SpecGpt 35 Turbo Instruct 0914Grok Code Fast
Context window4,097 tokens (4K)256,000 tokens (256K)
Max output tokensN/A256,000 tokens (256K)
Speed tierBalancedBalanced
VisionNoNo
Function callingNoYes
Extended thinkingNoYes
Prompt cachingNoYes
Batch APINoNo
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 35 Turbo Instruct 0914 inGpt 35 Turbo Instruct 0914 outGrok Code Fast inGrok Code Fast out
Azure$1.50/M$2.00/M——
Xai——$0.200/M$1.50/M

Frequently asked questions

Grok Code Fast has a larger context window: 256K tokens vs 4K. 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.
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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