Standard Compute
Model comparison 2026

Gemini 3.8 Flash vs GPT-5.4

Gemini 3.8 Flash
Google · Balanced · Proprietary
$1.65/1M · 1.0M ctx
GPT-5.4
OpenAI · Balanced · Proprietary
$6.25/1M · 1.1M ctx

Community vote

Pick a winner in each dimension. You can change your vote any time.

Output Quality
Correctness and depth of what it produces
Agentic Ability
Tool calls, instruction-following, and multi-step tasks
Speed
Tokens per second and time-to-first-token
Value for money
How much capability you get per dollar
Reliability
Consistent results: fewer refusals, loops and format breaks

Specs and pricing side by side

Spec
Gemini 3.8 Flash
GPT-5.4
Maker
Google
OpenAI
Blended price / 1M
$1.65
$6.25
Input / output
$0.75 in · $3.75 out / 1M tokens
$2.50 in · $15 out / 1M tokens
Context window
1.0M
1.1M
Open weights
No
No
Tool use
Yes
Yes
Reasoning
Yes
Yes
Output Quality
9.1
9.2
Agentic Ability
8.9
9.1
Speed
9.2
7.6
Value for money
8.8
8.1
Reliability
8.9
8.6

Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).

Verdict: Gemini 3.8 Flash or GPT-5.4?

Updated 2026-10-13

Choose Gemini 3.8 Flash if you want high-throughput agents and Gemini CLI users who want speed and big context. Choose GPT-5.4 if you want the OpenAI daily driver — strong and well-priced.

In our editorial scoring, Gemini 3.8 Flash leads in 3 of five dimensions (speed, value for money and reliability), while GPT-5.4 leads in 2. On price, Gemini 3.8 Flash runs about $1.65 per 1M tokens (blended) and is proprietary; GPT-5.4 is about $6.25 and proprietary.

Where Gemini 3.8 Flash falls short
  • Price doubles to $1.50/$7.50 on January 1, 2027
  • Weak on long terminal tasks (19.1% on Terminal-Bench 4.0)
Full Gemini 3.8 Flash breakdown →
Where GPT-5.4 falls short
  • A notch below 5.5 on the hardest tasks
  • Still pricier than open models
Full GPT-5.4 breakdown →

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