Which is cheaper, Claude Fable 5 or GPT-5.3 Chat?
As of August 20, 2026, GPT-5.3 Chat is 74% cheaper on blended LLM API pricing. GPT-5.3 Chat costs $1.75 per million input tokens and $14.00 per million output tokens ($15.75 blended 1M-in + 1M-out). Claude Fable 5 costs $10.00 / $50.00 per million tokens ($60.00 blended). Sources: https://platform.claude.com/docs/en/about-claude/pricing and https://developers.openai.com/api/docs/pricing. The cheapest LLM for your app still depends on how many output tokens you generate.
How much does Claude Fable 5 vs GPT-5.3 Chat cost per million tokens?
Claude Fable 5 Claude API pricing from Anthropic is $10.00 input and $50.00 output per million tokens via Anthropic. GPT-5.3 Chat OpenAI API pricing is $1.75 input and $14.00 output per million tokens via OpenAI. Use those four numbers, not ChatGPT Plus or Claude Pro subscription prices, when you are comparing APIs.
Which is better for coding, Claude Fable 5 or GPT-5.3 Chat?
Claude Fable 5 has a published SWE-bench Verified score of 95%. GPT-5.3 Chat does not have that eval on this page yet.
What is the context window for Claude Fable 5 vs GPT-5.3 Chat?
Claude Fable 5 supports a 1M token context window, while GPT-5.3 Chat supports 128K tokens. Claude Fable 5 offers a larger context window. Filling a larger window bills more input tokens, so the cheaper-per-million model can still cost more on long documents.
Which model performs better on benchmarks, Claude Fable 5 or GPT-5.3 Chat?
Shared benchmark scores for Claude Fable 5 and GPT-5.3 Chat are still limited. Check the comparison table for the evals each model has published. Check the comparison table for GPQA Diamond, SWE-bench, MMLU, HLE, and the other evals we track. Token price and benchmark score together are the usual LLM comparison, not either number alone.
Is Claude Fable 5 or GPT-5.3 Chat better for production use?
Both Claude Fable 5 and GPT-5.3 Chat are production API models. For cost-sensitive production traffic, GPT-5.3 Chat has better economics on the blended 1M-in + 1M-out scale. For maximum capability, weight the benchmark table for your domain. Many production stacks route cheap models for drafts and a frontier model for the hard turn, which is usually cheaper than sending everything to the expensive API.
Can I switch between Claude Fable 5 and GPT-5.3 Chat in my app?
Yes. Call Claude Fable 5 through Anthropic and GPT-5.3 Chat through OpenAI with separate API keys, or through a gateway that already wraps both. Keep prompts in tokens, not characters, when you estimate the invoice. AnotherWrapper templates can swap providers without rewriting auth and billing.
How accurate is this Claude Fable 5 vs GPT-5.3 Chat pricing data?
List rates are the latest published Claude API pricing from Anthropic and OpenAI API pricing, quoted per million tokens. Official rate sheets: https://platform.claude.com/docs/en/about-claude/pricing and https://developers.openai.com/api/docs/pricing. Prompt caching, batch APIs, and committed-use discounts can change the invoice. Benchmark scores are from official publications and independent evals, updated as new numbers land.
What is the output token limit for Claude Fable 5 and GPT-5.3 Chat?
Claude Fable 5 supports up to 128K output tokens per request, while GPT-5.3 Chat supports up to 16K output tokens. Output tokens are usually the expensive half of API pricing, so a higher max output cap is a capability, not a discount.
Which model has better throughput, Claude Fable 5 or GPT-5.3 Chat?
Claude Fable 5 runs at approximately 8.729100394623845 tokens/second while GPT-5.3 Chat runs at 100 tokens/second. GPT-5.3 Chat is faster in raw throughput. Throughput (tokens per second) and time-to-first-token are why two models with the same per-million-token price can still feel different in chat and agents.
How do I switch the models in this Claude Fable 5 vs GPT-5.3 Chat comparison?
Use the model pickers at the top of this LLM comparison. Search any model in the index and the URL updates. Open Claude Fable 5 or GPT-5.3 Chat from the sidebar for the single-model API pricing page, or go back to the LLM pricing table to sort by cheapest blended cost.
