CL-SN55 941 —
GPT-61S 885 -0.6%
GPT-56T 861 —
GPT-6S 825 -1.4%
CL-OP55X 819 -1.4%
MUSE-SPK 793 -1.4%
QWEN-38X 779 -2%
GPT-6A 778 -0.5%
CL-OP5H 712 -1.7%
CL-OP5X 710 -1.7%
KIMI-K3X 700 -2.5%
CL-OP46H 695 -1.7%
CL-FAB5H 693 -1.7%
CL-OP55H 693 -1.7%
CL-OP47H 684 -1.7%
GEM-37FH 649 -1.8%
GEM-38FH 634 -3.4%
GPT-56S 574 -0.5%
CL-OP47 540 -0.6%
INKL 531 —
GEM-3P 494 —
CL-OP46 490 —
CL-OP48 483 —
GEM-31P 459 -5.4%
GPT-6L 436 —
CL-SN55 941 —
GPT-61S 885 -0.6%
GPT-56T 861 —
GPT-6S 825 -1.4%
CL-OP55X 819 -1.4%
MUSE-SPK 793 -1.4%
QWEN-38X 779 -2%
GPT-6A 778 -0.5%
CL-OP5H 712 -1.7%
CL-OP5X 710 -1.7%
KIMI-K3X 700 -2.5%
CL-OP46H 695 -1.7%
CL-FAB5H 693 -1.7%
CL-OP55H 693 -1.7%
CL-OP47H 684 -1.7%
GEM-37FH 649 -1.8%
GEM-38FH 634 -3.4%
GPT-56S 574 -0.5%
CL-OP47 540 -0.6%
INKL 531 —
GEM-3P 494 —
CL-OP46 490 —
CL-OP48 483 —
GEM-31P 459 -5.4%
GPT-6L 436 —
← Back to feed

Gemini 3.8 Flash: $0.75/M Input, 75.8 on LiveBench, 1M Context

Google’s Gemini 3.8 Flash launched on OpenRouter around September 2, 2026 at $0.75 per million input tokens and $3.75 per million output, with a context window of 1,048,576 tokens. The Gemini 3.8 Live voice model followed two weeks later on September 15, reaching the top position on Artificial Analysis’s Speech-to-Speech Quality Index.

Benchmark Placement

Gemini 3.8 Flash has been evaluated on LiveBench, where it scores 75.8 overall. Third-party harnesses have also run it on SWE-bench Verified and Terminal-Bench evaluations. It enters the 3.8 generation with real benchmark data available from launch, unlike some earlier mid-tier releases.

Pricing in Context

At $0.75/$3.75 per million, Gemini 3.8 Flash sits above the Flash Lite tier — Gemini 3.1 Flash Lite launched at $0.25/M input — and carries the same 1,048,576-token context window that Google has shipped across its Flash and Flash Lite lines. The output-to-input price ratio of 5:1 matches recent Google Flash releases.

The 3.8 Generation

Gemini 3.8 Flash arrived first in the 3.8 series. Two weeks later, Gemini 3.8 Live landed via the Google Live API on September 15, scoring 82.6 on Artificial Analysis’s Speech-to-Speech Quality Index to take first place among speech-to-speech models. Third-party tau-Voice benchmarks put Gemini 3.8 Live at 68.6% overall and 35.1% on Sierra’s banking-sector voice tasks.

Together, the two models cover standard text inference and real-time voice in the same generational tier.

Key Numbers

  • Input cost: $0.75 per million tokens
  • Output cost: $3.75 per million tokens
  • Context window: 1,048,576 tokens
  • LiveBench overall: 75.8
  • Launch date: September 2, 2026
  • Sibling: Gemini 3.8 Live (launched September 15, AA Speech-to-Speech #1 at 82.6)