Gemini 3.1 Pro is Google’s Pro-tier multimodal model, combining strong reasoning and
\nagentic ability with a context window of roughly 1.05M tokens. It is served through Google AI
\nStudio and Vertex AI at $2 in \/ $12 out per million tokens.<\/p>\n
The pricing footnote matters more than the headline rate: prompts above 200K tokens are
\nbilled at roughly double the input rate. For a model whose main selling point is a million-token
\ncontext, that creates a sharp cost cliff exactly where you would want to use it. Budgeting a
\nlong-context feature on the $2 figure will understate the bill substantially once real user
\nprompts start crossing 200K. The practical response is to design around the threshold \u2014
\naggressive retrieval and reranking so that prompts stay under it \u2014 or to compare against a
\nmodel that charges one flat rate across the whole window, such as Claude Opus 4.8. Note too
\nthat Gemini 3.5 Flash sits below 3.1 Pro on price while outperforming it on coding and
\nagentic benchmarks, so 3.1 Pro is worth choosing for its multimodal breadth rather than by
\ndefault.<\/p>","protected":false},"excerpt":{"rendered":"
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