OpenAI: GPT-5.4

OpenAI

openai/gpt-5.4

GPT-5.4 is OpenAI’s latest frontier model, unifying the Codex and GPT lines into a single system. It features a 1M+ token context window (922K input, 128K output) with support for...

Context

1.05M

Input /1M

$2.50

Output /1M

$15.00

Latency (TTFT)

639ms

Pricing

Per 1M tokens, in USD

Input$2.50

Output$15.00

Cache read$0.25

Specs

text inimage infile intext outModerated

TokenizerGPT

Max output tokens128,000

Supported parameters

include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools

Where it ranks on price

Against 157 routable models

Input$2.50

Cheaper than 12% of routable models

Output$15.00

Cheaper than 8% of routable models

Benchmarks

No third-party benchmark data available for this model yet.

Call this model

Swap in your Mizan key — the request/response bodies are OpenAI chat-completion shaped.

cURL

curl https://api.app-mizan.com/v1/chat/completions \
  -H "Authorization: Bearer mizan_rt_..." \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.4",
    "messages": [{ "role": "user", "content": "Say hi in five words." }]
  }'

Models

OpenAI: GPT-5.4

OpenAI

openai/gpt-5.4

GPT-5.4 is OpenAI’s latest frontier model, unifying the Codex and GPT lines into a single system. It features a 1M+ token context window (922K input, 128K output) with support for...

Context

1.05M

Input /1M

$2.50

Output /1M

$15.00

Latency (TTFT)

639ms

Pricing

Per 1M tokens, in USD

Input$2.50

Output$15.00

Cache read$0.25

Specs

text inimage infile intext outModerated

TokenizerGPT

Max output tokens128,000

Supported parameters

include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools

Where it ranks on price

Against 157 routable models

Input$2.50

Cheaper than 12% of routable models

Output$15.00

Cheaper than 8% of routable models

Benchmarks

No third-party benchmark data available for this model yet.

Call this model

Swap in your Mizan key — the request/response bodies are OpenAI chat-completion shaped.

cURL

curl https://api.app-mizan.com/v1/chat/completions \
  -H "Authorization: Bearer mizan_rt_..." \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.4",
    "messages": [{ "role": "user", "content": "Say hi in five words." }]
  }'