Pricing, context window, capabilities, and release date — pulled from each provider's public docs. Both are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.
Both models stream in parallel through your own AIgateway key. Tokens, latency, and cost update as they arrive.
| GPT-5.4 openai/gpt-5.4 | Claude Sonnet 4.6 anthropic/claude-sonnet-4.6 | |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Family | GPT-5 | Claude 4 |
| Modality | text | text |
| Context window | 128,000 tok | 200,000 tok |
| Max output | 16,384 tok | 128,000 tok |
| Released | 2026-04-08 | 2026-04-13 |
| Input price | $2.50 /1M | $3.00 /1M |
| Output price | $15.00 /1M | $15.00 /1M |
| Cache read | $0.250 /1M | $0.300 /1M |
| Tools | yes | yes |
| Streaming | yes | yes |
| Vision | yes | yes |
| JSON mode | yes | yes |
| Reasoning | yes | yes |
| Prompt caching | yes | yes |
GPT-5.4 is OpenAI's flagship model with strong coding, reasoning, and multimodal capabilities.
Claude Sonnet 4.6 is Anthropic's latest balanced model offering strong coding, reasoning, and agentic capabilities with improved instruction following.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# Try GPT-5.4
client.chat.completions.create(
model="openai/gpt-5.4",
messages=[{"role":"user","content":"hello"}],
)
# Try Claude Sonnet 4.6 — same client, same key
client.chat.completions.create(
model="anthropic/claude-sonnet-4.6",
messages=[{"role":"user","content":"hello"}],
)