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v2.5.1: Next-Gen Flash & Promotional Rates

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@taruma taruma released this 02 Sep 22:21
· 28 commits to main since this release
v2.5.1
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PromptLab v2.5.1 introduces native support for Google's newly unveiled Gemini 3.8 Flash (gemini-3.8-flash), establishing it as the new default model across the entire workspace. In addition, this release integrates Google's introductory promotional pricing across the Gemini Flash series (3.8, 3.7, and 3.6 Flash) through December 31, 2026, cutting input and output token costs in half across all real-time cost estimations, itemized breakdown popovers, and model selector cards.

✨ Highlights

⚡ Gemini 3.8 Flash Default Baseline

Gemini 3.8 Flash is Google's most intelligent Flash model to date, engineered for long-horizon software engineering, autonomous agents, and complex enterprise workflows with a 1,048,576 token context window and March 2026 knowledge cutoff. PromptLab adopts Gemini 3.8 Flash as the primary default engine across the application:

  • 🚀 Default Workspace Engine — gemini-3.8-flash is now the initial selected model in the workspace state (app/page.tsx), the server-side proxy fallback (app/api/generate/route.ts), and the Engine Controls reset-to-defaults baseline (components/EngineControlsModal.tsx).
  • 🔗 Latest Alias Resolution — MODEL_ALIASES["gemini-flash-latest"] in lib/pricing.ts now resolves directly to gemini-3.8-flash.
  • 🎛️ Quick Model Selector — the Flash Latest option in components/QuickModelSelector.tsx now displays a 3.8 badge, and the active status indicator maps gemini-3.8-flash to "3.8 Flash".
  • 🏷️ Specific Models Catalog — added gemini-3.8-flash to the top of SPECIFIC_MODELS with a green NEW badge, Mar 2026 cutoff, and Sep 2, 2026 release date.
  • 🎥 Agentic Video Understanding — lib/video-utils.ts (isAgenticVideoSupported) now supports gemini-3.8-flash, enabling autonomous timeline exploration (Think → Act → Observe) with dynamic frame extraction on the new model.

🏷️ Introductory Promotional Pricing (Flash Series)

Google is offering promotional introductory rates for Gemini 3.8 Flash, Gemini 3.7 Flash, and Gemini 3.6 Flash effective through December 31, 2026:

Metric Introductory Promotional Rate (Through Dec 31, 2026) Standard Rate (Starting Jan 1, 2027)
Input Tokens $0.75 / 1,000,000 tokens $1.50 / 1,000,000 tokens
Output Tokens (incl. thoughts) $3.75 / 1,000,000 tokens $7.50 / 1,000,000 tokens
Context Cache Base $0.075 / 1,000,000 tokens $0.15 / 1,000,000 tokens
Context Cache Storage $0.50 / 1,000,000 tokens / hour $1.00 / 1,000,000 tokens / hour

PromptLab's central pricing engine in lib/pricing.ts automatically reflects these rates:

  • UI Rate Badges: Model cards in EngineControlsModal display IN: $0.75 / 1M and OUT: $3.75 / 1M.
  • Itemized Cost Breakdown: The Retro Lab brutalist cost popover in GenerationResultView computes exact line-by-line costs for uncached prompt tokens, cached prompt tokens, candidate tokens, and thought tokens using the promotional rates.
  • Historical Stability: Generations saved during this period store their calculated cost string at generation time, keeping archival cost records stable.

✨ What's New

  • ⚡ Gemini 3.8 Flash Model Integration — added gemini-3.8-flash to MODEL_PRICING_TABLE, MODEL_ALIASES, SPECIFIC_MODELS, and LATEST_MODELS.
  • 🏷️ Introductory Pricing for Flash Models — updated pricing configurations for Gemini 3.8 Flash, 3.7 Flash, and 3.6 Flash to $0.75 / 1M in and $3.75 / 1M out.
  • 🎥 Agentic Video Understanding on 3.8 Flash — updated isAgenticVideoSupported in lib/video-utils.ts and tooltips in VideoAssetCard.tsx.
  • 🎛️ Quick Model Selector 3.8 Badge — updated top navigation dropdown badge for Flash to 3.8 with 3.8 Flash label mapping.
  • 🏷️ Dynamic Version Display — footer status bar displays PromptLab v2.5.1 by Taruma Sakti automatically from package.json.

🔄 Changed

  • Default Model: Swapped default workspace model from gemini-3.7-flash to gemini-3.8-flash across app/page.tsx, app/api/generate/route.ts, and EngineControlsModal.tsx.
  • Cost Estimation Fallbacks: Updated fallback model parameter in HistoryCardSummary.tsx and HistoryViewerModal.tsx from gemini-3.7-flash to gemini-3.8-flash.
  • Model Badges: Marked gemini-3.8-flash as isNew: true and updated gemini-3.7-flash to isNew: false in SPECIFIC_MODELS.
  • Documentation: Synchronized baseline references in AGENTS.md and engine feature lists in README.md.

📁 Files Affected

  • package.json & package-lock.json — version bump to 2.5.1
  • lib/pricing.ts — added gemini-3.8-flash, updated gemini-flash-latest alias, and applied promotional rates to 3.8, 3.7, and 3.6 Flash
  • lib/video-utils.ts — added gemini-3.8-flash to isAgenticVideoSupported
  • app/page.tsx — updated selectedModel initial state to gemini-3.8-flash
  • app/api/generate/route.ts — updated fallback model to gemini-3.8-flash
  • components/EngineControlsModal.tsx — added 3.8 Flash to specific models, updated latest model subtitle, and reset defaults handler
  • components/QuickModelSelector.tsx — updated Flash badge to 3.8 and added label mapping
  • components/VideoAssetCard.tsx — updated agentic mode tooltips
  • components/HistoryCardSummary.tsx & components/HistoryViewerModal.tsx — updated cost calculation fallback model
  • CHANGELOG.md — added [v2.5.1] release entry
  • AGENTS.md & README.md — synchronized model baseline and documentation
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