Claude: pricing, limits, errors and comparisons
Anthropic's Claude models and apps: the Claude API, model choices, subscription plans and usage limits. Claude Code has its own page.
42 articles · last updated Oct 2, 2026
Pricing and costs
- Claude Cowork Pricing: What You Actually Pay on Each Plan
There's no Cowork add-on to buy. Pick the plan whose allowance fits how much work you hand off, and know what extra usage costs before you hit the limit.
Updated
- Claude Opus 4.6 Pricing: Complete Guide to API Costs, Subscriptions & Savings (2026)
Complete pricing guide for Claude Opus 4.6 — Anthropic's flagship model at $5/$25 per million tokens. Covers standard, fast mode ($30/$150), 1M context beta, Batch API (50% off), prompt caching (90% savings), subscription plans, and competitive comparison vs GPT-5.2 and Gemini 3 Pro.
Updated
- Claude API Pricing Guide 2026: Complete Cost Breakdown Per Million Tokens
Master Claude API pricing with our comprehensive 2026 guide. Compare Opus, Sonnet, Haiku models, calculate costs with interactive tools, and learn batch processing & prompt caching savings up to 90%.
Updated
- Claude API Pricing Guide 2025: Complete Cost Analysis & Smart Optimization Strategies
Discover the real cost of Claude API usage and learn proven strategies to optimize your spending while maximizing AI capabilities.
Updated
Free tiers and limits
- Does Claude Pro Have a Free Trial? How to Check Your Account in 2026
There is no Claude Pro trial you can start on demand. Free is a standing $0 plan. Pro at no cost comes only by promotion, gift, or a shared guest pass.
Updated
- Claude Fable 5.1 Usage Limits: Weekly Allowance, Extra Usage, and Model Switching
Max includes Fable within its shared weekly allowance; Pro requires credits from the first request. Check the relevant limit and your credit settings before continuing.
Updated
- Claude Opus 5.5 Limit Reset: When to Spend It
Read which limit your card restores, spend a weekly card when your regular reset is days away, and keep heavy work on Opus 5.5 unless it needs Fable 5.1.
Updated
- Claude API Quota Tiers and Limits Explained: Complete Guide 2026
Comprehensive guide to Claude API's 4-tier usage system. Covers rate limits (RPM, ITPM, OTPM), spend limits, tier advancement from $5 to $400+, and optimization strategies including prompt caching.
Updated
Errors and fixes
- Claude API Error 500: Fix api_error Without Blind Retries
Recover from a returned Claude internal server error by checking status, saving request IDs, retrying with a bounded budget, verifying the same path, and escalating with evidence.
Updated
- Claude 529 Overloaded Error: What It Means and How to Fix It (2026)
Claude 529 overloaded_error usually means Anthropic is temporarily overloaded or an upstream service is saturated. This guide explains how to verify that quickly, how it differs from 429 and Claude chat capacity warnings, and how to reduce repeat failures.
Updated
- How to Fix Claude API 429 Rate Limit Error: Complete 2026 Guide with Working Code
Stop losing requests to 429 errors. This comprehensive guide provides 8 battle-tested solutions with production-ready Python and TypeScript code, plus monitoring strategies to prevent errors before they happen.
Updated
- How to Fix Claude API 429 Rate Limit Error: Complete Guide 2026
Fix Claude API 429 rate limit errors with exponential backoff retry logic, response header monitoring, and prompt caching optimization. Complete code examples for Python and TypeScript included.
Updated
- Claude API 429 Error: Complete Solution Guide with Working Code Examples
Stop losing requests to 429 errors. This technical guide provides 8 battle-tested solutions with ready-to-use code for Python and JavaScript developers.
Updated
Comparisons and alternatives
- GPT-6.1 Sol vs Claude Opus 5.5: Half the Price, 1/6 the Task Cost
Try GPT-6.1 Sol first for high-volume work under 272K input tokens. Keep Opus 5.5 where a failed attempt costs more review time than the tokens you save.
Updated
- Gemini 4 Argon vs Claude Opus 5.5 vs Sonnet 5.5: Which to Use
As of October 1, 2026, only the two Claude models can be called. Use Sonnet 5.5 for well-scoped work, Opus 5.5 for long open-ended jobs, and re-test Argon later.
Updated
- Claude Opus 5.5 vs GPT-5.6 Sol: Same Price Tag, Different Bills
Opus 5.5 costs less above 272K input tokens and on cache reads; GPT-5.6 Sol writes about half the output per task. Already on Sol? Test GPT-6 Sol or the newer GPT-6.1 Sol first.
Updated
- Claude Sonnet vs Opus vs Haiku vs Fable: Which Model to Use
Haiku 4.5 is the cheapest and fastest Claude model, Fable 5.1 the most capable. Where to start depends on whether you spend plan limits or pay per API token.
Updated
- GPT-6 Astra vs Claude Fable 5.1 API Cost: Where the Tie Breaks
Their standard input and output rates match. Cache behavior, Astra's 272K threshold, batch processing, tools, and your token mix determine the actual bill.
Updated
- OpenAI vs Claude Prompt Caching Cost: Cached Token Pricing and Break-Even Math
A current billing guide for repeated-context API workloads: OpenAI cached input, Claude cache writes and reads, break-even examples, and cache-hit verification.
Updated
- GPT-5.4 vs Claude Sonnet 4.6: Which Should You Use in 2026?
GPT-5.4 is the better default for most developers who want one model for coding, long-context work, and tool-heavy agents in March 2026. Claude Sonnet 4.6 still has a real place in Claude-first workflows, but its base published API pricing is not cheaper than GPT-5.4.
Updated
- Claude Opus 4.6 vs Sonnet 4.6: Which Should You Use in 2026?
Claude Sonnet 4.6 is the better default for most users in March 2026, while Claude Opus 4.6 is the justified upgrade for harder reasoning, longer autonomous work, and larger single-pass outputs. This guide compares pricing, context, access, and workflow fit using current Anthropic sources.
Updated
- Gemini API vs OpenAI vs Claude: Complete 2026 Cost Decision Guide
Choosing between Gemini, OpenAI, and Claude APIs in 2026 requires more than comparing per-token prices. This guide breaks down real monthly costs across three workload sizes, exposes hidden costs from thinking tokens and long-context premiums, and provides a concrete optimization playbook that can cut your API spending by 60-80%. Updated with the latest GPT-5.4, Gemini 3.1 Pro, and Claude Opus 4.6 pricing.
Updated
- Gemini 3.1 Pro vs Opus 4.6 vs Codex 5.3: The Definitive Comparison (March 2026)
Three frontier models released in February 2026 have fundamentally changed the AI landscape. This guide compares Gemini 3.1 Pro, Claude Opus 4.6, and GPT-5.3-Codex with browser-verified pricing, real benchmark data, and practical recommendations for developers choosing their next production model.
Updated
- Gemini 3.1 Pro Preview vs Claude Opus 4.6: The Complete Comparison You Actually Need (2026)
Google's Gemini 3.1 Pro Preview leads 13 of 16 benchmarks at half the cost, but Claude Opus 4.6 dominates expert knowledge work and tool-augmented reasoning. This guide breaks down every benchmark, compares real pricing, and tells you exactly which model to choose based on your specific use case.
Updated
- GLM-5 vs Claude Opus 4.6 vs GPT-5.3 Codex: The Definitive Three-Way Comparison (2026)
As of February 2026, three heavyweight AI models launched in the same week: Claude Opus 4.6 ($5/MTok, best reasoning), GPT-5.3 Codex (~$1.75/MTok, fastest terminal tasks), and GLM-5 (~$0.11/MTok, open-source 745B MoE). This guide provides the industry's first complete three-way comparison with verified benchmarks, real-world cost analysis, and a clear decision framework.
Updated
- GPT-5.3 Codex vs Claude Opus 4.6: The Complete Comparison Guide (2026)
GPT-5.3 Codex and Claude Opus 4.6 launched within 24 hours of each other in February 2026. This guide uses verified benchmark data, real pricing analysis, and scenario-based recommendations to help you choose the right model — or decide to use both.
Updated
- Claude Opus 4.6 vs GPT-5.3-Codex: Complete Comparison Guide (February 2026)
Claude Opus 4.6 and GPT-5.3-Codex both launched February 5, 2026. Opus dominates reasoning with 91.9% on tau-bench and 1606 Elo on GPQA Diamond, while Codex leads terminal coding at 77.3% on Terminal-Bench. This guide covers verified benchmarks, real pricing with cost optimization strategies, API integration code, and a scenario-based decision framework.
Updated
- GPT 5.2 Codex vs Claude Opus 4.5: Complete Comparison Guide (2026)
Compare OpenAI GPT 5.2 Codex and Anthropic Claude Opus 4.5 head-to-head with January 2026 benchmarks, real-world speed tests, pricing analysis, and clear recommendations for developers.
Updated
- Claude Sonnet 4 vs 3.7: Complete Performance Comparison & Migration Guide (2025)
10.4% performance boost, same price - should you upgrade from Claude 3.7?
Updated
- Claude Sonnet 4 vs GPT-4.1: 2025 Performance Benchmarks Show 18% Coding Gap Despite 47% Price Difference
72.7% vs 54.6% on SWE-bench, but GPT-4.1 costs 47% less. Which AI model should you choose?
Updated
Guides and setup
- Claude Image Generation Connector: Which to Add, What It Costs
A connector hands your Claude prompt to an outside image service. Choose by who runs it, the account it needs, and its price. Free plans get one custom connector.
Updated
- Claude Mythos Access: Who Can Get Mythos 5.1 and How to Apply
Mythos Preview is now Mythos 5.1, still with no signup, waitlist, or free tier. Only approved organizations get it; Fable 5.1 is the same model with safeguards.
Updated
- Claude Opus 5.5 Effort: Choose a Level, Set It, and Measure the Cost
Start at medium for Opus 5.5, then move effort only when your own completed tasks justify the extra thinking, time, and cache cost.
Updated
- Claude Opus 5.5: API Price, Model ID, and Migration Checks
Opus 5.5 has a lower direct API token rate than Opus 5, but an existing Messages API client may need more than a model ID change. Here is the price math and the compatibility check.
Updated
- Claude Fable 5.1: API Pricing, Changes, and Migration Guide
Fable 5.1 does not lower Fable's base token rates. It cuts cache-read cost by 75% and introduces tool-choice and thinking-history rules that can break an existing client.
Updated
- Move ChatGPT or Gemini Memory to Claude—and Use Takeout Correctly
For Gemini-to-Claude moves, use Claude's prompt to create a reviewed memory handoff. Use Takeout for history and backup—not as a raw memory import.
Updated
- How to Get a Claude API Key Without Buying Someone Else’s Secret
Do not pay for a loose key string. Pay for access in an account you control, confirm which provider bills the request, and prove the route with a small auditable call.
Updated
- Is There a Claude Student Discount in 2026? The Routes That Actually Exist
A student email does not automatically discount Claude Pro. The useful options are public individual plans, access sponsored by a participating university, and separate student applications.
Updated
- Claude 4 Opus API: Ultimate Guide to Anthropic's Most Powerful AI Model (2025)
Claude 4 Opus is Anthropic's flagship model for advanced reasoning and coding. This guide focuses on what it does well, when it is worth the cost, and how to integrate it through official paths.
Updated
- Claude Opus 4.6 API Key: Complete Guide to Setup, Integration & Production Deployment (2026)
Complete one-stop guide to obtaining and integrating your Claude Opus 4.6 API key. Covers account setup, Python and Node.js SDK integration, security best practices, rate limit handling, and cost optimization strategies. Includes production-ready code examples verified February 2026.
Updated
- How to Use Prompt Caching in Claude API: Complete 2026 Guide with Code Examples
Master Claude API prompt caching with this comprehensive guide. Get production-ready code examples in Python and TypeScript, detailed cost calculations, and expert troubleshooting tips to optimize your API usage.
Updated
- Claude MCP (Model Context Protocol): Complete Implementation Guide 2025
Connect Claude to GitHub, VSCode, databases, and 1000+ tools with MCP
Updated