Anthropic (Claude) and OpenAI (GPT) are the two API providers most teams evaluate side-by-side in 2026. Both have three tiers, both bill per token, both offer caching and batch discounts. Their pricing structures look similar at first glance — but the per-tier cost ratios differ meaningfully.
OpenAI's lineup separates "reasoning" models from "chat" models. Pricing varies by family; consult the OpenAI pricing page for live numbers. As a rough comparison, OpenAI's top-tier reasoning models are priced in the same band as Opus 4.7 (~$15–$60 per million input depending on the model), while their mid-tier chat models compete with Sonnet 4.6 at roughly $3–$10 per million input.
Where the structures differ
Cache pricing. Anthropic cached reads are 10% of input price (Sonnet 4.6: $0.30/M cached). OpenAI cache discounts vary by model — typically 50% off input, less aggressive than Anthropic's 90% off.
Batch API. Both offer ~50% off for batched, async workloads with 24h SLA.
Output multiplier. Anthropic charges 5× input price for output across all tiers. OpenAI's ratio varies by model (commonly 3–4×).
Which to pick?
Heavy RAG / repeated long-context. Anthropic wins on cost because of the 90%-off cached-read pricing.
Pure tool-use or function-calling agents. Both work well; benchmark on your specific task.
Code generation. Claude Sonnet 4.6 and Opus 4.7 have strong reputations for code; benchmark vs. your chosen OpenAI tier on real PRs from your codebase.
Is Anthropic's Claude API cheaper than OpenAI's API?
It depends on tier and workload. For workloads with heavy prompt-cache reuse (RAG, repeated long-context), Anthropic's 90%-off cached-read pricing makes it markedly cheaper than OpenAI. For single-shot generation without caching, the two are within ~20% of each other at comparable tiers.
Do Anthropic and OpenAI offer batch pricing?
Yes — both offer roughly 50% off standard pricing for batched async requests with a 24h SLA. Use batch for offline classification, eval runs, or any workload where you don't need real-time response.
Can I mix Claude and OpenAI in the same product?
Yes. Many production apps route by task: Claude for long-context summarization and coding, OpenAI for specific reasoning tasks. The Vercel AI SDK, LangChain, and LiteLLM all support both providers behind a unified interface.