GPT Realtime 2.1 API Pricing

As of October 10, 2026, GPT Realtime 2.1 costs $4.00 per 1M input tokens and $24.00 per 1M output tokens on OpenAI, with cache reads at $0.40 per 1M tokens. It has a 128,000-token context window and returns up to 32,000 tokens per response.

By OpenAIModel ID gpt-realtime-2.1Prices updated October 10, 2026Checked October 10, 2026

Input: $4.00 / 1M tokens
Output: $24.00 / 1M tokens
Cache read: $0.40 / 1M tokens
Context window: 128,000 tokens
Max output: 32,000 tokens
Providers: 2
Added to LiteLLM: July 8, 2026

GPT Realtime 2.1 pricing by provider

2 listings across 2 providers. Token prices are in US dollars per 1M tokens. The highlighted row is the price quoted above.

Provider	Model name in LiteLLM	Input	Output	Cache read	Context
OpenAI	`gpt-realtime-2.1`	$4.00	$24.00	$0.40	128K
Azure OpenAI	`azure/gpt-realtime-2.1`	$4.00	$24.00	$0.40	32K

Other GPT Realtime 2.1 prices on OpenAI

Audio input	$32.00 per 1M tokens
Audio output	$64.00 per 1M tokens

What GPT Realtime 2.1 costs in practice

1,000 requests with 2,000 input and 500 output tokens each

OpenAI	$20.00
Azure OpenAI	$20.00

100 long-document requests with 100,000 input and 2,000 output tokens each

OpenAI	$44.80
Azure OpenAI	$44.80

GPT Realtime 2.1 features

Input: text, image, audio. Output: text, audio.

Function calling
Parallel tool calls
Audio input
Audio output

Use GPT Realtime 2.1 with LiteLLM

Call GPT Realtime 2.1 through the LiteLLM Python SDK, or put it behind the LiteLLM proxy and send OpenAI-format requests to /v1/realtime. LiteLLM tracks the cost of every request at these prices.

Python SDK

from litellm import completion

response = completion(
    model="gpt-realtime-2.1",
    messages=[{"role": "user", "content": "Hello!"}],
)

Proxy config.yaml

model_list:
  - model_name: gpt-realtime-2.1
    litellm_params:
      model: gpt-realtime-2.1
      api_key: os.environ/OPENAI_API_KEY

Call the proxy

curl http://0.0.0.0:4000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer sk-1234" \
  -d '{
    "model": "gpt-realtime-2.1",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

GPT Realtime 2.1 FAQ

How much does GPT Realtime 2.1 cost?

GPT Realtime 2.1 costs $4.00 per 1M input tokens and $24.00 per 1M output tokens on OpenAI, with cache reads at $0.40 per 1M tokens.

What is the context window of GPT Realtime 2.1?

GPT Realtime 2.1 has a 128,000-token context window and returns up to 32,000 tokens per response.

Which providers offer GPT Realtime 2.1?

GPT Realtime 2.1 is available from 2 providers through LiteLLM: OpenAI and Azure OpenAI.

How do I call GPT Realtime 2.1 with an OpenAI-compatible API?

Use the LiteLLM Python SDK with model="gpt-realtime-2.1", or add the model to the LiteLLM proxy's config.yaml and send requests to /v1/realtime from any OpenAI client. LiteLLM tracks the cost of every request at the prices on this page.

What features does GPT Realtime 2.1 support?

GPT Realtime 2.1 supports function calling, parallel tool calls, audio input and audio output.

When did LiteLLM add GPT Realtime 2.1?

GPT Realtime 2.1 was added to LiteLLM's model price file on July 8, 2026.

Sources

Prices come from LiteLLM's open-source model_prices_and_context_window.json, which LiteLLM uses to calculate the cost of every request. Provider pricing pages:

LiteLLM docs: OpenAI, Azure OpenAI.

Provider pages: OpenAI, Azure OpenAI.