Is Claude Cheaper Than GPT? The Honest Math
"Is Claude cheaper than GPT?" is one of the most-asked pricing questions in AI development — and the honest answer is: at the top tier, they're now priced identically, and at the mid tier, they're nearly identical too. The real cost difference between Claude and GPT doesn't live in the headline rate card. It lives in cache discounts, token thresholds, and the fine print neither provider puts in the headline.
Below: the full tier-by-tier comparison with verified October 2026 rates, a workload worked through both providers, and the five details that actually decide which one is cheaper for you.
The Tier-by-Tier Rate Card
Both providers now sell a three-tier ladder, and the headline rates are mirror images of each other:
| Tier | OpenAI | Anthropic | Headline verdict |
|---|---|---|---|
| Flagship | GPT-6 Astra: $10 / $50 | Claude Fable 5.1: $10 / $50 | Exact tie |
| Workhorse | GPT-6.1 Sol: $2 / $10 | Claude Sonnet 5.5: $2 / $10 | Exact tie |
| Budget | GPT-6 Luna: $0.10 / $0.50 | Claude Haiku 5.5: $0.10 / $0.50 | Tie (see caveats) |
| Previous-gen flagship | GPT-5.6 Sol: $4 / $20 (promo) | Claude Opus 5.5: $4 / $20 | Tie on headline — Opus wins on cache |
Rates are USD per 1M tokens, input / output. Two caveats already visible: GPT-5.6 Sol's $4/$20 is promotional pricing "available at least through November 21, 2026" with no published follow-on price, while Opus 5.5's $4/$20 is the stable list price. And Claude Haiku 5.5's $0.10/$0.50 only applies to prompts under 100,000 tokens — above that it steps up to $0.50/$2.50.
The Workload Math: $97.68 vs $102.96
Headline rates don't pay invoices. Run the blog's reference workload — 1,100 tasks/month, each with 12K fresh input, 48K cached input, and 6K output tokens — through both providers' workhorse models:
| Model | Input | Cached input | Output | Per task | Per month |
|---|---|---|---|---|---|
| GPT-6.1 Sol | 12K x $2.00 | 48K x $0.10 | 6K x $10.00 | $0.0888 | $97.68 |
| Claude Sonnet 5.5 | 12K x $2.00 | 48K x $0.20 | 6K x $10.00 | $0.0936 | $102.96 |
The only difference in that table is the cache line: GPT-6.1 Sol charges $0.10 per 1M cached tokens (5% of input) versus Sonnet 5.5's $0.20. On this cache-heavy workload, one number decides the winner — and it's not the headline rate. We ran the same math for Claude Opus 5.5 and GPT-6.1 Sol individually if you want the full breakdowns.
The flagships are a tie on this workload too: GPT-6 Astra lands at $514.80/month and Claude Fable 5.1 at $475.20/month — the gap is Fable's deeper cache discount (2.5% vs 10%), nothing else. At the budget end, both GPT-6 Luna and Claude Haiku 5.5 cost $5.15/month — identical, as long as Haiku stays under its 100K threshold.
The Five Details That Actually Decide It
1. Cache discount depth. This is the real battlefield. Anthropic's cache reads cost 10% of input on most models, but only 5% on Opus 5.5 and Sonnet 5.5, and 2.5% on Fable 5.1. OpenAI's cached reads cost 10% on most GPT models, 5% on GPT-6.1 Sol. On cache-heavy agentic workloads — where the same context is re-read thousands of times — a 5-point difference in the cache rate outweighs the headline price. Our prompt caching guide shows how to structure prompts so you actually get these rates.
2. OpenAI's 272K threshold. On GPT models, a single request over 272K input tokens reprices the entire request at 2x input and 1.5x output. Anthropic has no equivalent long-context surcharge — a 900K-token Claude request bills at the standard rate. If your workload routinely sends long prompts, this alone can make Claude cheaper regardless of the rate card.
3. Haiku's 100K step-up. Claude Haiku 5.5's headline $0.10/$0.50 only covers prompts up to 100,000 tokens; above that it's $0.50/$2.50. GPT-6 Luna has no published threshold — $0.10/$0.50 is $0.10/$0.50. Budget-tier buyers with long prompts should price both sides.
4. Promo expiry dates. GPT-5.6 Sol's $4/$20 promo is "available at least through November 21, 2026"; Gemini-style, Anthropic doesn't do expiring promos on its current line. If you're choosing a model to build on past November, OpenAI's promo-priced models carry a calendar risk that Anthropic's don't. We track the deadlines in our cheapest LLM API comparison.
5. Batch discounts stack the same way. Both providers offer 50% off for batch processing (Anthropic's Batch API, OpenAI's Batch and Flex tiers), and both discounts stack with caching. No advantage to either side here — but it means the cheapest production setup on either provider is always batched plus cached.
Run Your Own Numbers
The honest takeaway: Claude and GPT are in a genuine price war, and in October 2026 the headline rates are a draw. Your bill is decided by your cache ratio, your prompt lengths, and whether you trip a threshold — not by which logo is on the invoice. Run your own workload through the AI API Cost Calculator with real rates from both providers before you commit.
FAQ
Is Claude cheaper than GPT?
Neither — the headline rates are tied tier-for-tier in October 2026. On cache-heavy workloads GPT-6.1 Sol beats Sonnet 5.5 slightly ($97.68 vs $102.96/month on our reference workload) because its cached reads are cheaper ($0.10 vs $0.20 per 1M). On long-prompt workloads, Claude often wins because OpenAI reprices requests over 272K tokens.
Which Claude model is the cheapest?
Claude Haiku 5.5 at $0.10 input / $0.50 output per 1M tokens for prompts under 100K tokens — it undercuts every other Claude model by 10–100x on headline rates, at the cost of capability. Above 100K tokens the rate steps up to $0.50/$2.50.
Which GPT model is the cheapest?
GPT-6 Luna at $0.10 input / $0.50 output per 1M tokens, with no published prompt-length threshold. For everyday work, GPT-6.1 Sol ($2/$10) is the value pick.
Does switching providers actually save money?
Less than you'd hope from the headline rates — the tiers are matched. The savings come from matching your workload to the right tier and turning on caching: a flagged-down workload on the wrong tier costs more than the "expensive" provider's right tier. Measure your token mix first, then decide.
Are these prices stable?
Mostly. Anthropic's current line has no published promo expiries. OpenAI's GPT-5.6 Sol promo runs "at least through November 21, 2026" — after that, pricing is unpublished. Re-verify any rate older than 30 days before budgeting.
Prices verified October 21, 2026 against published provider rate cards and independent pricing trackers. Rates change — confirm on the provider's pricing page before committing.