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FAQ

What Is the Difference Between ChatGPT and Claude?

Quick Answer

ChatGPT (OpenAI) and Claude (Anthropic) are the two most-used AI assistants in 2026, and the honest answer to which is better is that it depends on the task and, increasingly, on the tier you pick within each family. Both vendors now ship a ladder of models rather than one flagship — OpenAI runs GPT-6-Astra at the top with the cheaper GPT-5.6 line beneath it, Anthropic runs Claude Fable 5.1 and Opus 5 at the top with Sonnet 5 and Haiku 4.5 beneath. The most consequential difference for everyday work is context: every current Claude model except Haiku ships a 1M-token window. The most consequential difference for cost is that the mid-tier of each family is roughly five times cheaper than the flagship for output, and is what most people should actually be using.

Both vendors now ship tiered lineups, and the price gap inside a family is wider than the gap between families — OpenAI runs GPT-6-Astra ($10/$50) down to GPT-5.6-Luna ($0.20/$1.20); Anthropic runs Claude Fable 5.1 ($10/$50) down to Haiku 4.5 ($1/$5).
Context is the clearest practical difference: Claude Fable 5.1, Opus 5 and Sonnet 5 all ship 1M-token windows (~555,000 words), enough to hold a whole codebase or contract bundle in one prompt.
At the value tier the two are near-identical on price: Claude Sonnet 5 at $2/$10 versus GPT-5.6-Terra at $2/$12 per million input/output tokens.
Consumer plans are ~$20/month each. Via BYOK you pay API rates instead — a typical 500-in/500-out prompt on Sonnet 5 costs about $0.006, so $20 buys roughly 3,300 of them.
You don't have to pick: Prompt Anything Pro supports both via BYOK and switches per-prompt, which matters most for dropping to a cheaper tier on easy tasks.

Published May 22, 2026Last updated September 5, 2026By PlugMonkey Team, Editorial

Company Background and Philosophy

OpenAI created ChatGPT and the GPT model family. They pioneered the consumer AI assistant space and have the largest user base, and their models are the default in most third-party tooling. Anthropic created Claude and was founded by former OpenAI researchers with an explicit focus on AI safety. Anthropic's stated approach emphasises helpfulness, harmlessness and honesty, which tends to show up as a model that is more willing to flag uncertainty rather than answer confidently regardless.

The Current Model Lineups (September 2026)

Both vendors publish a tiered lineup. Picking the right tier matters more than picking the right vendor — the price gap within a family is wider than the gap between families.

Claude Fable 5.1 — $10 / $50 per million input / output tokens. 1M context, 128K max output. Anthropic positions it for demanding reasoning and long-horizon agentic work.
Claude Opus 5 — $5 / $25. 1M context, 128K max output. Anthropic's recommended default for most workloads, aimed at complex agentic coding and enterprise work.
Claude Sonnet 5 — $2 / $10. 1M context, 128K max output. Positioned as the best balance of speed and intelligence, and the value pick in the family.
Claude Haiku 4.5 — $1 / $5. 200K context, 64K max output. The fastest model, for high-volume or latency-sensitive work.
GPT-6-Astra — $10 / $50. OpenAI's newest flagship, priced level with Claude Fable 5.1.
GPT-5.6-Sol — $4 / $20. The step below the flagship.
GPT-5.6-Terra — $2 / $12. OpenAI's value tier, priced against Claude Sonnet 5.
GPT-5.6-Luna — $0.20 / $1.20. The budget tier, roughly ten times cheaper than Terra.

Context Window: The Clearest Practical Difference

Claude Fable 5.1, Opus 5 and Sonnet 5 all ship a 1M-token context window — roughly 555,000 words on Anthropic's current tokenizer. That is enough to hold an entire mid-size codebase, a full contract bundle, or a book in a single prompt without chunking. Claude Haiku 4.5 is the exception at 200K tokens. If your work involves feeding in large documents whole rather than in pieces, this is the difference that will decide the choice for you, and it is worth checking OpenAI's current per-model context figures against your own workload rather than assuming parity.

Pricing Comparison (API vs Subscription)

Both vendors sell a ~$20/month consumer chat plan (ChatGPT Plus, Claude Pro) and separately sell API access priced per token. With Prompt Anything Pro's BYOK approach you pay API rates directly, which is dramatically cheaper for anyone whose usage is bursty rather than constant.

Like-for-like value tiers — Claude Sonnet 5 at $2 / $10 versus GPT-5.6-Terra at $2 / $12. Identical input cost; Claude is 17% cheaper on output.
Like-for-like flagships — Claude Fable 5.1 and GPT-6-Astra are both $10 / $50.
What a real prompt costs — a 500-token input plus 500-token output on Sonnet 5 runs about $0.006. A $20/month subscription is the equivalent of roughly 3,300 such prompts every month.
Batch and cache discounts — Anthropic's Batch API is 50% off, and prompt-cache reads cost 10% of the base input price, which materially changes the maths for repeated-context workloads.
When a subscription still wins — if you use a chat interface heavily every day and value the app, image generation and mobile clients, $20/month is fair. BYOK wins when usage is intermittent.

Why Not Choose? Use Both with Prompt Anything Pro

You do not have to pick a side. Add API keys for both OpenAI and Anthropic and switch models with a single click — run the same prompt against Claude Sonnet 5 and GPT-5.6-Terra and compare, use a 1M-context Claude model for whole-document analysis and a cheaper tier for routine rewriting. Because tiers within each family differ in price by 5-10x, the ability to drop to a cheaper model for easy tasks usually saves more than choosing the "right" vendor ever does. See all supported models for the complete list, including Google Gemini and local models.

The Numbers Behind This Answer

Every figure below cites a primary source. Click through to verify.

1M tokens

Context window on Claude Fable 5.1, Opus 5 and Sonnet 5 — roughly 555,000 words on Anthropic's current tokenizer, enough to analyse an entire codebase, book or contract bundle in a single prompt without chunking. Claude Haiku 4.5 is the exception at 200K.

Source: Anthropic — Claude models overview2026

$2 / $10

Claude Sonnet 5 API pricing per million input / output tokens, versus $2 / $12 for OpenAI's comparable GPT-5.6-Terra. Identical input cost, 17% cheaper output. Anthropic's Batch API halves both, and prompt-cache reads cost 10% of base input.

Source: Anthropic and OpenAI published API pricing2026