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-5.5 openai/gpt-5.5 | Bytedance Seedance 2.0 (Text To Video) bytedance/seedance-2.0 | |
|---|---|---|
| Provider | OpenAI | ByteDance |
| Family | GPT-5 | |
| Modality | text | video |
| Context window | 1,000,000 tok | — |
| Max output | 16,384 tok | — |
| Released | 2026-04-24 | 2026-05-17 |
| Input price | $5.00 /1M | $0.014 /sec |
| Output price | $30.00 /1M | — |
| Cache read | — | — |
| Tools | yes | — |
| Streaming | yes | — |
| Vision | — | — |
| JSON mode | yes | — |
| Reasoning | yes | — |
| Prompt caching | — | — |
GPT-5.5 is OpenAI's flagship model with strong coding, reasoning, and multimodal capabilities.
ByteDance's next-generation video model with a unified multimodal architecture. Generates high-quality video with synchronized audio from text, images, video clips, and audio inputs. Supports multimodal references (up to 9 images, 3 videos, 3 audio files), native audio generation, video editing, video extension, intelligent duration, and adaptive aspect ratio.
# pip install aigateway-py openai
# aigateway-py: sub-accounts, evals, replays, jobs, webhook verify.
# openai SDK: chat/embeddings/images/audio — drop-in compat per our SDK's own guidance.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# Try GPT-5.5
client.chat.completions.create(
model="openai/gpt-5.5",
messages=[{"role":"user","content":"hello"}],
)
# Try Bytedance Seedance 2.0 (Text To Video) — same client, same key
client.chat.completions.create(
model="bytedance/seedance-2.0",
messages=[{"role":"user","content":"hello"}],
)