GPT 5.3 Codex API Pricing & Quick Start
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
Technical specifications
Pricing comparison
BazaarLink retail price alongside AA's observed market standard.
BazaarLink price our site
Market reference Artificial Analysis
Independent benchmarks
Scores below come from Artificial Analysis, an independent third party. BazaarLink does not participate in the testing.
Top 5 — CodingCoding Index leaderboard
openai/gpt-5-6-sol-xhigh78$5 / $30openai/gpt-5-6-sol-high77$5 / $30anthropic/claude-opus-5-xhigh77$5 / $25Quick Start
Use GPT 5.3 Codex via BazaarLink API — just change the base_url:
from openai import OpenAI
client = OpenAI(
base_url="https://bazaarlink.ai/api/v1",
api_key="sk-bl-YOUR_API_KEY",
)
response = client.chat.completions.create(
model="openai/gpt-5.3-codex",
messages=[{"role": "user", "content": "Hello!"}],
)
print(response.choices[0].message.content)import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://bazaarlink.ai/api/v1",
apiKey: "sk-bl-YOUR_API_KEY",
});
const response = await client.chat.completions.create({
model: "openai/gpt-5.3-codex",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(response.choices[0].message.content);Why use GPT 5.3 Codex via BazaarLink?
- ✓USD billing (TWD-quoted) + unified invoices — no foreign credit card needed for Taiwan teams
- ✓OpenAI-compatible API — zero code changes required
- ✓Automatic failover — multi-provider redundancy for the same model
- ✓Chinese-language support — local team, instant help
Frequently Asked Questions
What is GPT 5.3 Codex?
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
How much does the GPT 5.3 Codex API cost?
GPT 5.3 Codex costs $1.7500 per 1M input tokens and $14.0000 per 1M output tokens when accessed through BazaarLink.
How do I use GPT 5.3 Codex with the OpenAI SDK?
Set base_url to "https://bazaarlink.ai/api/v1" and use model ID "openai/gpt-5.3-codex". All OpenAI SDK methods (chat.completions, embeddings, streaming) work without code changes.
What is the context window for GPT 5.3 Codex?
GPT 5.3 Codex supports a context window of 400,000 tokens.
Is GPT 5.3 Codex available for free?
GPT 5.3 Codex is a paid model. BazaarLink offers free trial credits on registration so you can test it without a credit card.
Relay integrity checks
- Tested endpoints
- 48 runs
- Independent hosts
- 35
- Model-family fingerprint match
- 81%
- Anomalies detected
- 43 runs
- Data range
- past 90 days
BazaarLink Probe verifies endpoints that claim to serve this model and flags behavior that differs from the reference baseline.
View the full integrity report →Related models and links
More from this provider: OpenAI