Claude’s latest token‑counter upgrade lets developers compare token usage across model families. The tool now supports four flagship Anthropic releases—Opus 4.7, Opus 4.6, Sonnet 4.6, and Haiku 4.5—so teams can see how changes in tokenization affect cost and performance. This is especially useful now that Opus 4.7 adopts a new tokenizer. Developers can now run identical prompts against each model to quantify differences.

Anthropic reports that the updated tokenizer inflates token counts by roughly 1.0–1.35×, depending on content type. When the author fed the Opus 4.7 system prompt into the counter, token usage spiked 1.46× compared to Opus 4.6. Because pricing stays at $5 per million input tokens, the new model could cost ~40% more per prompt. This shift forces teams to re‑evaluate prompt length and cost models.

Beyond text, Opus 4.7 now accepts images up to 2,576 pixels on the long side, more than triple earlier limits. Testing a 3.7 MB PNG returned a 3.01× token increase over Opus 4.6, meaning visual inputs will be pricier. The broader vision capability also opens opportunities for richer multimodal applications. Engineers can now benchmark visual tokenization side‑by‑side with text for cost optimization.

The counter’s image support uses the same API endpoint as text, simplifying integration. By exposing token counts for all four models, the tool equips developers to balance fidelity and expense. Ultimately, the upgrade underscores how tokenizer changes ripple through pricing, prompting immediate adjustments in prompt engineering workflows. This real‑time visibility helps teams avoid hidden cost spikes.