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From the blog

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5 min read

xAI retired Grok Imagine Quality overnight — your bill fell a cent an image, and so did your quality

Effective November 2, 2026, xAI retired the grok-imagine-image-quality slug: requests now resolve silently to grok-imagine-image-2.0 at low quality, $0.01 per image cheaper at every resolution — $0.05 to $0.04 at 1K, $0.06 to $0.05 at 1.5K, $0.07 to $0.06 at 2K. Nothing errors, so the only way to know is the model field in your responses. Restoring the old quality on medium costs a cent more than you were paying.

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6 min read

One pool for ChatGPT and Codex: OpenAI merges your allowance in December — and hasn't told you how big it is

Starting in December, Plus, Pro, and Business plans draw from one token-based allowance shared across ChatGPT and Codex. Instant chat is exempt; at the limit you wait, upgrade, or buy credits. OpenAI has published no per-plan token figure and no exact start date — so the size of the pool, and whether it is bigger or smaller than the two limits it replaces, is unknowable until it lands.

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Resources

Guides & references

42 published chapters

Cost Handbook

Understand token bills, infrastructure and the tradeoffs behind a budget.

Outline available · work in progress

Engineer’s Handbook

Explore the outline for building, evaluating and operating AI systems.

A reference for comparing rates

Model price index

Compare published input, output and cached-token rates. Check the source and retrieval date.

Browse by task

Free tools directory

Find tools with free access and review their limits, requirements and source links.

Curated reading

Reading stack

Explore an independently scored guide to books on building with AI.

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About The AI Bill

The AI Bill is edited by Hussain Sehorewala. It provides free tools for understanding AI costs, alongside guides and articles on building with models.

Read the sources, check the dates, and separate a vendor’s benchmark from evidence about your own workload.

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