---
author: "Umesh Malik"
canonical: "https://umesh-malik.com/blog/tag/api"
description: "Explore articles tagged with API by Umesh Malik — AI Engineer, LLM & GenAI Developer. Learn API best practices, practical tips, and in-depth guides."
title: "Umesh Malik's Blog - API Articles | API Tutorials"
tokens: 796
generator: "scripts/generate-page-markdown.mjs"
---

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# API

6 articles

 [![Kimi K3 vs Claude Fable 5 head-to-head showing benchmarks, pricing, and where the open 2.8T model wins](https://umesh-malik.com/blog/kimi-k3-vs-fable-5-cover.png)

LLM Engineering • Jul 19, 2026

### Kimi K3 vs Claude Fable 5: When the Open Model Is Worth the Switch

Kimi K3 beats Claude Fable 5 on cost by a wide margin and loses on agentic tasks. The benchmarks that decide it, and how to run K3 where it actually wins.

6 min read

Read more →](https://umesh-malik.com/blog/kimi-k3-vs-claude-fable-5)

 [![GPT-5.6 Sol vs Terra vs Luna comparison showing price, coding strength, and cost per task](https://umesh-malik.com/blog/gpt-5-6-sol-terra-luna-cover.png)

LLM Engineering • Jul 11, 2026

### GPT-5.6 Sol vs Terra vs Luna: The Routing Strategy That Cuts Cost

GPT-5.6 Sol vs Terra vs Luna compared on price, coding, latency, and cost per task — plus a routing strategy that cuts your bill without wrecking quality.

5 min read

Read more →](https://umesh-malik.com/blog/gpt-5-6-sol-vs-terra-vs-luna)

 [![OpenAI GPT-5.6 family showing Sol, Terra, and Luna tiers with benchmarks, pricing, and 1.05M context](https://umesh-malik.com/blog/gpt-5-6-cover.png)

LLM Engineering • Jul 11, 2026

### GPT-5.6 API: Pricing, Thinking Modes, and the Shared Context Trap

GPT-5.6 API pricing ($1–$30/1M), the Ultra and Max thinking modes, and a 1.05M context window that is shared — with the fine print that breaks agent loops.

10 min read

Read more →](https://umesh-malik.com/blog/openai-gpt-5-6-sol-terra-luna-guide)

 [![OpenAI GPT-5.4 overview showing professional work, coding, computer use, and 1M context](https://umesh-malik.com/blog/gpt-5-4-cover.png)

LLM Engineering • Mar 6, 2026

### GPT-5.4 for Agents: Computer Use, MCP Tool Calls, and Real Pricing

GPT-5.4's native computer use and MCP tool calls are the real upgrade for agents. What holds up in a loop, what the 1M context costs, and how Pro compares.

12 min read

Read more →](https://umesh-malik.com/blog/openai-gpt-5-4-complete-guide)

 [![OpenAI GPT-5.3 Instant overview showing three key improvements: fewer refusals, better web answers, and smoother conversational tone](https://umesh-malik.com/blog/gpt-5-3-instant-cover.png)

LLM Engineering • Mar 4, 2026

### OpenAI GPT-5.3 Instant: 26.8% Fewer Hallucinations, Reduced Refusals, and Better Web Answers

GPT-5.3 Instant brings 26.8% fewer hallucinations, fewer needless refusals, and better web-sourced answers — what changed and why it matters for devs.

10 min read

Read more →](https://umesh-malik.com/blog/openai-gpt-5-3-instant-fewer-refusals-better-answers)

 [![Node.js backend architecture showing Express server, middleware chain, REST API endpoints, and database layer](https://umesh-malik.com/blog/nodejs-backend-cover.png)

Web Engineering • Feb 10, 2026

### Node.js Backend for Frontend Developers: A Practical Guide

A frontend developer's guide to building a Node.js backend: Express, REST APIs, middleware, databases, auth, and deployment — plus the mindset shift you need.

8 min read

Read more →](https://umesh-malik.com/blog/nodejs-backend-for-frontend-developers)