OpenAI

GPT-5.5

OpenAI's next flagship general model for complex reasoning, coding, and professional workflows, with a 1M context window and upcoming support in the Responses and Chat Completions APIs

Category Text Model ID gpt-5.5

Context Length1M tokens

Model TypeLarge Language Model (LLM)

API AvailabilityComing soon in the Responses API and Chat Completions API

Pricing & Specs

💰 Pricing

Input$5 / M tokens

Output$30 / M tokens

⚙️ Specs

Context Length1M tokens

Model TypeLarge Language Model (LLM)

API AvailabilityComing soon in the Responses API and Chat Completions API

Doc StatusCompiled from OpenAI's latest statement for API developers: gpt-5.5 will be available at $5 / 1M input tokens, $30 / 1M output tokens, with a 1M context window

API Examples

Python (OpenAI SDK)

from openai import OpenAI

client = OpenAI(
    api_key="your-api-key",
    base_url="https://api.xairouter.com/v1"
)

response = client.chat.completions.create(
    model="gpt-5.5",
    messages=[
        {"role": "user", "content": "Summarize this requirement and break it into development tasks"}
    ]
)

print(response.choices[0].message.content)

cURL (OpenAI API)

curl https://api.xairouter.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "gpt-5.5",
    "messages": [
      {"role": "user", "content": "Summarize this requirement and break it into development tasks"}
    ]
  }'

Developer Assist

# Configure ~/.codex/config.toml
cat > ~/.codex/config.toml << 'EOF'
model_provider = "xai"
model = "gpt-5.5"
model_reasoning_effort = "xhigh"
plan_mode_reasoning_effort = "xhigh"
model_reasoning_summary = "none"
model_verbosity = "medium"
model_context_window = 1000000
model_auto_compact_token_limit = 900000
tool_output_token_limit = 6000
approval_policy = "never"
sandbox_mode = "danger-full-access"
suppress_unstable_features_warning = true

[model_providers.xai]
name = "OpenAI"
base_url = "https://api.xairouter.com"
wire_api = "responses"
requires_openai_auth = false
env_key = "XAI_API_KEY"

[features]
multi_agent = true

[agents]
max_threads = 4
max_depth = 1
job_max_runtime_seconds = 1800
EOF

# Set environment variable (add to ~/.bashrc or ~/.zshrc)
export XAI_API_KEY="sk-Xvs..."

# Launch Codex
codex

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