DeepSeek R1 costs $0.55 per million input tokens. OpenAI o1 costs $15.00.

That's not a typo. That's a 27x difference for models that score within 1-2 points of each other on reasoning benchmarks.

I run Tokonomics, an AI cost metering proxy, and we see the invoices. Teams running 1 million reasoning calls per month on o1 are paying $75,000. The same workload on R1? $2,740. The difference is $72,260. Per month.

The Benchmark Reality Check

Here's what caught my attention. R1 isn't just "cheaper but worse." It actually matches o1 on most reasoning benchmarks:

Source: DeepSeek-R1 Technical Report, arXiv 2501.12948, January 2025.

R1 wins on math. Ties on coding. The only place o1 pulls clearly ahead is GPQA Diamond (graduate-level science reasoning), by 6.5 points.

At 27x the price, o1 would need to be dramatically better to justify the premium. It isn't.

Why Is R1 So Cheap?

Three things:

1. Lower operating costs. DeepSeek operates from China, where compute and labor costs run 40-60% lower than US labs (Stanford HAI AI Index Report, 2025).

2. Mixture-of-Experts architecture. R1 has 671B parameters but only activates 37B per query. Less compute per inference call means lower cost per token.

3. Aggressive pricing for market share. DeepSeek is buying volume with margins that OpenAI can't (or won't) match.

The Hidden Cost: Thinking Tokens

Both models generate internal chain-of-thought tokens that you pay for. R1 typically produces 2-4x more thinking tokens than visible output on complex problems.

So a query that returns 1,000 visible tokens might generate 3,000 thinking tokens under the hood. Your effective output cost jumps from $2.19/M to roughly $8.76/M for visible tokens.

Still way cheaper than o1's $60/M. But if you're budgeting, account for thinking token overhead.

Caching Makes It Worse (for o1)

DeepSeek gives a 90% discount on cached inputs: $0.055/M. OpenAI gives 50%: $7.50/M.

With caching, the gap goes from 27x to 136x.

For workloads with repetitive system prompts (and reasoning tasks often have long system prompts), R1 input costs become almost negligible.

When o1 Still Wins

I'm not saying o1 is dead. It earns its premium in specific cases:

• Structured outputs. OpenAI's JSON schema enforcement mode has no R1 equivalent.
• Function calling. Native tool use on o1 is polished. R1 requires manual prompt engineering.
• Enterprise SLAs. OpenAI offers formal uptime guarantees. DeepSeek's are less defined.
• OpenAI ecosystem lock-in. Assistants API, batch API, fine-tuning. Switching has real friction.

The teams that stay on o1 through our proxy are usually locked into function calling or structured outputs. The reasoning quality itself isn't what keeps them.

The Practical Play

Start with R1. Validate on your production data. Escalate to o1 only where R1 falls short.

This captures 90%+ of the savings while keeping o1 available for the edge cases where it genuinely matters.

At $72,260/month in potential savings on high-volume workloads, "try R1 first" isn't a bold strategy. It's the obvious one.

Full pricing breakdown with interactive comparison charts: DeepSeek R1 vs o1 Inference Cost Analysis

If you're tracking LLM costs across multiple providers, Tokonomics is a proxy that meters every call and sets budget alerts before surprises hit.

Sources: DeepSeek-R1 Technical Report (arXiv 2501.12948) | DeepSeek API Pricing | OpenAI API Pricing | Stanford HAI AI Index 2025