All models
Head to head
Gemini 4 Hydrogen vs GPT 5.1 Codex
Price, context, inputs and filters. No benchmarks theatre.
Both cost about the same per message.
Gemini 4 Hydrogen holds 2.6× more context.
Fact
Made by
Google
OpenAI
Content tier
Mainstream
Mainstream
Intelligence
Brilliant
Brilliant
Estimated price per message
~4.59 credits≈ 21 messages for $1
~4.55 credits≈ 21 messages for $1
Context window
1M tokens≈ 1,613 pages of text in one go
400K tokens≈ 615 pages of text in one go
Reads
Text, Images, Video, Audio
Text, Images
Writes
Text
Text
Tool use
Yes - search, memory, code and more
Yes - search, memory, code and more
Served via
OpenRouter
OpenRouter, Unbottled AI
Status
Current
Legacy
A typical message: 16K tokens in, 1.5K out. Short replies cost less. Models served via OpenRouter bill the real provider cost plus our markup, so actual charges vary. 1 credit = $0.01.