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Gemini 3.8 Flash is the most intelligent Flash model in Tess — built for long-horizon coding, autonomous agents, and multi-step reasoning, with 50% off through the end of 2026.

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What changed vs Gemini 3.7 Flash

Native reasoning (effort low / medium / high, default medium), tools (function calling / MCP, search, computer use), and vision. On hard tasks it works harder — extra reasoning steps and iterative tool calls, which can use more tokens at higher effort.

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Pricing (Tess credits)

Values follow Models and Costs (credits per 100 tokens). This is the 50% off rate through 31 December 2026:
50% off through the end of 2026. Pricing changes from 1 January 2027.
Captura De Tela 2026 09 04 Às 11 07 32

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Ideal use cases in Tess

  1. Long-horizon coding agents that have to finish a change end to end
  2. Multi-step agent workflows — planning, tool loops, error recovery
  3. Quantitative and professional analysis (finance, legal-style research)
  4. Hard multi-step reasoning across STEM and knowledge work (HLE-Verified 54.9%)
  5. Web development against visual references
  6. Multimodal turns (text + image + audio + video)
Best practices
  • Prefer 3.8 Flash over 3.7 Flash when coding quality and agent reliability matter more than token count.
  • Keep 3.7 Flash for efficiency-first workloads — Google still supports it, and 3.8 can spend more tokens at higher effort.
  • Keep 3.5 Flash-Lite for high-volume extraction, classification, and summarization.
See also: Gemini 3.7 Flash · Gemini Flash · Models and Costs · Gemini 3.8 Flash (Google).