R4
@r4.codes
Open frontier models for coding agents. One /v1 API speaking OpenAI Chat Completions, Responses, and Anthropic Messages. Kimi K3, GLM 5.3, and DeepSeek V4 Flash behind one key, billed per token in USD — no lock-in.
R4's Company Logos
R4's Brand Colors
Hex Code
Color name
RGB
HSL
CMYK
#D3765B
Japonica
211, 118, 91
14, 58, 59
0, 44, 57, 17
#10130F
Log Cabin
16, 19, 15
105, 12, 7
16, 0, 21, 93
#FFFFFF
White
255, 255, 255
0, 0, 100
0, 0, 0, 0
About R4
R4 Coder is a provider of coding plans built around open frontier AI models for developers and coding agents. Its single API key supports OpenAI Chat Completions, Responses, and Anthropic Messages interfaces, giving users access to multiple models through one integration without platform lock-in. The catalog includes Kimi K3, DeepSeek V4 models, and GLM 5.
3 variants, with options suited to front-end generation, general coding, multimodal tasks, rigorous development, and text-focused batch work. Pricing is usage-based and billed per token in U. S.
dollars, with rates for input, output, and cache reads. R4 Coder also offers prepaid Code Lite, Code Pro, and Code Max credit packages, each providing a multiple of the purchase price in spendable balance, valid for 30 days and usable across catalog models. Package features include concurrent-request limits and selectable spend caps; the listed packages are currently sold out, with waitlists available.
The service provides documentation, model and pricing information, a usage area, and a leaderboard to help developers explore and manage their access
Brand industry
Computers Electronics and Technology
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