Loading…
base_url to https://api.codegateway.dev/v1, keep everything else identical.Spec | Claude Sonnet 4.6 | Claude Opus 4 | Claude Sonnet 4.5 (reference) |
|---|---|---|---|
Context window | 200K tokens | 200K tokens |
200K tokens
Max output | 64K tokens | 32K tokens | 8K tokens |
Input price (official) | $3 / 1M tokens | $15 / 1M tokens | $3 / 1M tokens |
Output price (official) | $15 / 1M tokens | $75 / 1M tokens | $15 / 1M tokens |
Strengths | Everyday coding, code review, content, long conversations | Complex reasoning, math, long-chain planning | Same as 4.5 |
TTFT (approx.) | ~1s | ~2–4s | ~1s |
Prices from Anthropic's official documentation (May 2026). Subject to change — check Anthropic's model page for current rates.
When accessing through CodeGateway, multiply by the applicable tier multiplier (1.2x–1.5x, declining with cumulative spend). See CodeGateway pricing tiers.
Rule of thumb: Sonnet 4.6 handles 95% of tasks adequately. Reach for Opus 4 only when Sonnet's quality is measurably insufficient and the task value justifies 5x the cost.
import anthropic
# Only change: base_url points to CodeGateway. Everything else is identical to Anthropic's SDK.
client = anthropic.Anthropic(
api_key="your-codegateway-api-key",
base_url="https://api.codegateway.dev/v1"
)
# Sonnet 4.6 — everyday use
response = client.messages.create(
model="claude-sonnet-4-6",
max_tokens=2048,
messages=[{
"role": "user",
"content": "Review this Python function for performance issues and edge cases:\n\n[your code here]"
}]
)
print(response.content[0].text)
# Opus 4 — high-complexity reasoning
response_opus = client.messages.create(
model="claude-opus-4-5",
max_tokens=4096,
messages=[{
"role": "user",
"content": "Design a distributed transaction system that maintains ACID guarantees under high concurrency..."
}]
)
print(response_opus.content[0].text)import Anthropic from "@anthropic-ai/sdk";
const client = new Anthropic({
apiKey: "your-codegateway-api-key",
baseURL: "https://api.codegateway.dev/v1",
});
async function withSonnet(prompt: string): Promise<string> {
const response = await client.messages.create({
model: "claude-sonnet-4-6",
max_tokens: 2048,
messages: [{ role: "user", content: prompt }],
});
return response.content[0].type === "text" ? response.content[0].text : "";
}
// Streaming for long outputs
async function streamSonnet(prompt: string): Promise<void> {
const stream = await client.messages.stream({
model: "claude-sonnet-4-6",
max_tokens: 8192,
messages: [{ role: "user", content: prompt }],
});
for await (const chunk of stream) {
if (
chunk.type === "content_block_delta" &&
chunk.delta.type === "text_delta"
) {
process.stdout.write(chunk.delta.text);
}
}
}Migration from Sonnet 4.5 (or Claude 3 series) requires only a model ID change — the API contract is identical.
From | To | Notes |
|---|---|---|
|
| Drop-in replacement. Check max_tokens if you relied on the 8K output limit. |
|
| Bigger context, 64K output. Re-validate prompts on complex tasks. |
|
| Significant performance improvement, especially on long-chain reasoning. |
Key behavioral changes to test after migration:
max_tokens tightly for cost control, verify the cap still applies.Scenario: 500 code review requests/day, average 2,000 input tokens + 500 output tokens each.
Config | Daily tokens | Official price/day | CodeGateway/day (1.5x new user) | Monthly (CodeGateway) |
|---|---|---|---|---|
Sonnet 4.6 | 1M in + 250K out | $6.75 | $10.13 | ~$304 |
Opus 4 | 1M in + 250K out | $33.75 | $50.63 | ~$1,519 |
Haiku 4.5 (light tasks) | same | ~$0.80 | ~$1.20 | ~$36 |
For routine code review, Sonnet 4.6 is the right call. Opus 4's cost is 5x — reserve it for tasks that actually need it.
CodeGateway's tier multiplier drops as cumulative spend increases (1.5x → 1.2x minimum). Once monthly spend exceeds $200 equivalent, effective rates improve. See pricing tiers for the full schedule.
Q: Is the quality difference between Sonnet 4.5 and 4.6 noticeable?
A: A: On multi-step coding tasks and complex reasoning, yes — Sonnet 4.6 is measurably better. For simple completions and text generation, the difference is minor. The main reason to migrate is the 64K output window.
Q: Does Opus 4 support Extended Thinking?
A: A: Yes, and it's currently the strong Claude model for Extended Thinking tasks. Extended Thinking works as expected through CodeGateway.
Q: What model IDs do I use with CodeGateway?
A: A: Standard Anthropic model IDs: claude-sonnet-4-6, claude-opus-4-5, claude-haiku-4-5. CodeGateway routes to the corresponding upstream models.
Q: Where do I get a CodeGateway API key?
A: A: Sign up at codegateway.dev, top up your balance, and create an API key in the dashboard. New accounts receive a $2 starter credit.
Q: Does CodeGateway support both Sonnet 4.6 and Opus 4 simultaneously?
A: A: Yes — all current Anthropic models are available, including Haiku 4.5, Sonnet 4.5, Sonnet 4.6, and Opus 4. Switch between them by changing the model ID in your requests.