Tirth Gajjar (@tirthgajjar)

GPT-4o deprecation: dates, replacement and how to migrate

GPT-4o leaves the OpenAI API on 14 January 2027. As of 22 October 2026, that date covers the listed GPT-4o, GPT-4o mini, GPT-4.1 and GPT-4.1 mini snapshots and the fine-tunes built on them, and OpenAI

1d ago · 16 min readbigcircle.hashnode.dev

Agentic workflows vs AI agents, and when not to build one

An agentic workflow is a multi-step process in which a language model does part of the work, such as drafting, classifying, retrieving or calling a tool. The term covers two designs: in one, code you

3d ago · 19 min readbigcircle.hashnode.dev

PII tokenization for LLMs: tokenization vs masking, with code

PII tokenization replaces each piece of personal data in a prompt with a stand-in token before the request leaves your network, and puts the real value back after the model replies. The provider sees

5d ago · 13 min readbigcircle.hashnode.dev

How much does an AI agent cost to build and run?

AI agent cost has three parts: the build, the run and the keep-alive. The build is the system that can take a real task. The run is the model calls, tool calls and retries each task then spends, and t

1Oct 23 · 15 min readbigcircle.hashnode.dev

Why AI agents report unfinished work as done

An action-taking agent can receive a 200 OK while the customer’s task remains incomplete. The API may have accepted the request while a queue still rejects it, a downstream system fails, a browser sub

2Oct 21 · 14 min readbigcircle.hashnode.dev

Tirth Gajjar

About

Available for

Tirth Gajjar's blogs

GPT-4o deprecation: dates, replacement and how to migrate

Agentic workflows vs AI agents, and when not to build one

PII tokenization for LLMs: tokenization vs masking, with code

How much does an AI agent cost to build and run?

Why AI agents report unfinished work as done

Tirth Gajjar

About

Available for

Tirth Gajjar's blogs

GPT-4o deprecation: dates, replacement and how to migrate

Agentic workflows vs AI agents, and when not to build one

PII tokenization for LLMs: tokenization vs masking, with code

How much does an AI agent cost to build and run?

Why AI agents report unfinished work as done

Tirth Gajjar

About

Available for

Tirth Gajjar's blogs

GPT-4o deprecation: dates, replacement and how to migrate

Agentic workflows vs AI agents, and when not to build one

PII tokenization for LLMs: tokenization vs masking, with code

How much does an AI agent cost to build and run?

Why AI agents report unfinished work as done

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Tirth Gajjar

About

Available for

Tirth Gajjar's blogs

GPT-4o deprecation: dates, replacement and how to migrate

Agentic workflows vs AI agents, and when not to build one

PII tokenization for LLMs: tokenization vs masking, with code

How much does an AI agent cost to build and run?

Why AI agents report unfinished work as done