OpenAI: GPT-5.5 (batch)

OpenAI

openai/gpt-5.5

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...

Context

1.05M

Input /1M

$2.50

Output /1M

$15.00

Latency (TTFT)

690ms

Pricing

Per 1M tokens, in USD

Input$2.50

Output$15.00

Cache read$0.25

Specs

file inimage intext intext outModerated

TokenizerGPT

Max output tokens128,000

Supported parameters

include_reasoningmax_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

Intelligence38.6

Coding74.9

Agentic37.3

Composite scores (0–100) from Artificial Analysis, via OpenRouter's model catalog.

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-5.5",
    "messages": [{ "role": "user", "content": "Say hi in five words." }]
  }'

Models

OpenAI: GPT-5.5 (batch)

OpenAI

openai/gpt-5.5

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...

Context

1.05M

Input /1M

$2.50

Output /1M

$15.00

Latency (TTFT)

690ms

Pricing

Per 1M tokens, in USD

Input$2.50

Output$15.00

Cache read$0.25

Specs

file inimage intext intext outModerated

TokenizerGPT

Max output tokens128,000

Supported parameters

include_reasoningmax_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

Intelligence38.6

Coding74.9

Agentic37.3

Composite scores (0–100) from Artificial Analysis, via OpenRouter's model catalog.

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-5.5",
    "messages": [{ "role": "user", "content": "Say hi in five words." }]
  }'