Claude Opus 4.7 arrived on April 16 with better coding and vision skills, but there's a catch: its new tokenizer is making the same prompts more expensive to run. Users have been reporting higher token consumption compared to Opus 4.6, and now a web tool called Tokenomics lets you see exactly how much more you're paying.
Tokenomics - Anthropic Token Cost Calculator
Anthropic kept the API price per token the same as Opus 4.6, but they've been upfront about the tokenizer change potentially increasing the token count for identical inputs. Since AI services charge based on the number of input and output tokens processed, a more verbose tokenizer means your bill goes up even for the same work.
The tool that shows the damage
Tokenomics is a web app built by AI expert Bill Chambers in response to the tokenizer update. You paste in a prompt, and it spits back the token count and estimated cost for both Opus 4.7 and 4.6.
Following Chambers's own example, I typed "WHO ARE YOU" into the calculator.
The result, calculated using Anthropic's token counting API, was stark. Opus 4.6 used 10 tokens. Opus 4.7 used 20. That's double the tokens, which means double the input cost for that simple query.
Even with lowercase letters ("who are you"), the gap remained. Opus 4.6 stayed at 10 tokens, while Opus 4.7 dropped to 14—still a 40% increase.
Tokenomics also has a leaderboard page aggregating all user submissions. On average, Opus 4.7's token count is up 38.6%. The bottom of the page shows a running feed of recent comparisons, making it painfully clear that both short and long prompts are getting hit.
It's not just one tool saying this
Other analyses confirm the trend. One detailed test found that Opus 4.7's token consumption increased by 1.005x to 1.07x for Japanese, Chinese, Korean, and emojis, and by 1.20x to 1.47x for English and code.
I Measured Claude 4.7's New Tokenizer. Here's What It Costs You.
Over on Hacker News, the practical complaints are rolling in. One user on the Pro plan said they hit their usage limit after just four inputs while trying to build a webpage. Another on the "Max 5x" plan reported reaching their five-hour limit in just two hours.
Another comment on Hacker News
But there's a silver lining for some workloads
It's not all bad news. An analysis by third-party firm Artificial Analysis found that while Opus 4.7's input costs increased, its reasoning and output costs decreased. The overall cost ended up slightly lower than Opus 4.6. This means for tasks heavy on internal reasoning, Opus 4.7 could actually be cheaper to run—a nuance worth considering if you're planning your AI budget around Anthropic's latest flagship model.
So before you dive into those new coding and vision features, you might want to check your token usage. That performance boost in Claude Opus 4.7 might come with a hidden tax on your API bill.