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NewGPT-6 Astra and Claude Fable 5.1 are live
Claude
ChatGPT

Software, evolved to intelligence.

One API key for every Claude and ChatGPT model. Plug it into Claude Code, Codex, Cursor or your own code, and switch between 24 models without rewriting a line.

Use Claude & ChatGPT with one key.

Think of it as ChatGPT Pro and Claude Max in one, on a single balance.See the note about ChatGPT Pro and Claude Max

Animated demo: in VS Code, a prompt is typed into the AI chat panel and the selected model writes the code. Use the model menu to pick any of the newest Claude and ChatGPT models, all through one evolved.to key.

Supported models

  • claude-opus-5.5
  • claude-fable-5-1
  • gpt-astra-6
  • claude-fable-5
  • claude-mythos-5
  • gpt-5
  • claude-sonnet-5
  • claude-opus-5
  • gpt-5-mini
  • claude-opus-4.8
  • claude-opus-4.7
  • claude-sonnet-4.6
  • gpt-4.1
  • claude-opus-4.6
  • claude-opus-4.5
  • gpt-4.1-mini
  • claude-haiku-4.5
  • claude-sonnet-4.5
  • gpt-4o
  • claude-opus-4.1
  • claude-opus-4
  • gpt-4o-mini
  • claude-sonnet-4
  • claude-haiku-3.5
models behind one key
24
families: Claude & ChatGPT
2
token context window
262K
per 1M input tokens
from $1.30

Claude & ChatGPT

Every model from both families. One key.

Frontier reasoning, balanced everyday models and fast lightweight ones, all on the same key, the same balance and one rate table.

Claude · by Anthropic

All Claude models

Fable, Mythos, Opus, Sonnet and Haiku. Native Anthropic Messages API, ready for Claude Code.

Explore 17 Claude models

Pricing

Pay for tokens, not seats

Pick Claude, ChatGPT or both. Credit packs from $15, worth up to 16 times what you pay. Every request is billed per token at one public rate table. No subscriptions.

Claude All Models & ChatGPT All Models

Fable 5.1 & Opus 5.5NewAstra 6New

Think of it as ChatGPT Pro and Claude Max in one, on a single balance.*

  • Starter

    $50 credit

    $20one-time

    $50Save 60%

    Try every model on a real project.

    • Claude All Models
    • ChatGPT All Models
    • Fable 5.1 & Opus 5.5NewAstra 6New
    • ≈ 1.8M frontier output tokens
    Get $50 credit
  • Builder

    $100 credit

    $25one-time

    $100Save 75%

    Daily coding sessions and side projects.

    • Claude All Models
    • ChatGPT All Models
    • Fable 5.1 & Opus 5.5NewAstra 6New
    • ≈ 3.6M frontier output tokens
    Get $100 credit
  • Pro

    Pro choice

    $200 credit

    $35one-time

    $200Save 82%

    For professionals shipping with agents every day.

    • Claude All Models
    • ChatGPT All Models
    • Fable 5.1 & Opus 5.5NewAstra 6New
    • ≈ 7.1M frontier output tokens
    Get $200 credit
  • Power

    Most popular

    $400 credit

    $50one-time

    $400Save 87%

    Heavy agent workloads, all day long.

    • Claude All Models
    • ChatGPT All Models
    • Fable 5.1 & Opus 5.5NewAstra 6New
    • ≈ 14.3M frontier output tokens
    Get $400 credit
  • Scale

    $1,000 credit

    $80one-time

    $1,000Save 92%

    Teams and long-running automations.

    • Claude All Models
    • ChatGPT All Models
    • Fable 5.1 & Opus 5.5NewAstra 6New
    • ≈ 35.7M frontier output tokens
    Get $1,000 credit
  • Max

    Best value

    $2,000 credit

    $140one-time

    $2,000Save 93%

    The lowest cost per token we offer.

    • Claude All Models
    • ChatGPT All Models
    • Fable 5.1 & Opus 5.5NewAstra 6New
    • ≈ 71.4M frontier output tokens
    Get $2,000 credit

Buying for a team, or need more than $2,000 in credit?

Write to our sales team and we will set up the credit and keys that fit.

sales@evolved.to

* ChatGPT Pro and Claude Max are subscription plans sold by OpenAI and Anthropic. evolved.to is independent and does not sell those plans; your credit pays for API access to the same Claude and ChatGPT model families.

Why evolved.to

Built for the way you already ship

Keep your tools, your SDKs and your prompts. Change one base URL and every model is on the table.

One key, every model

A single key replaces separate provider accounts, keys and invoices. Manage it, add credit and revoke it from one dashboard.

••••••••••••••3f9aactive
  • claude-fable-5-1
  • claude-opus-5.5
  • claude-sonnet-5
  • gpt-astra-6
  • gpt-5
  • claude-haiku-4.5
  • gpt-4.1
  • gpt-5-mini
  • +16 more

The right model per task

Plan with a frontier model, build with a balanced one, fan out sub-agents on a fast one. Just by name.

  • Planclaude-fable-5-1
  • Buildclaude-sonnet-5
  • Reviewgpt-5
  • Sub-agentsclaude-haiku-4.5

Native protocols

Anthropic and OpenAI wire formats, served as-is. Official SDKs and clients work without shims.

/v1/messagesAnthropic
/v1/responsesOpenAI
/v1/chat/completionsAll models

Built for momentum

Swap to a newer or cheaper model without touching your integration. It is a one-line change.

  client.messages.create({-   model: "claude-sonnet-4.5",+   model: "claude-sonnet-5",    max_tokens: 16000,  })

Balance, usage, history

See your balance, token usage and request history per key, and add credit in seconds.

Balance$84.20

How it works

Two minutes from key to first token

No new SDK, no proxy to run, no prompt rewrites.

  1. Get your key

    Buy a credit pack and your key is ready in the dashboard. It is shown once, in full, so store it like a password.

  2. Point your client at evolved.to

    Set the base URL to api.evolved.to and use your key. Claude Code, Codex, Cursor and the SDKs all support it.

  3. Pick any model by name

    Send claude-opus-5, gpt-5 or any other model ID. Switch whenever you like; your integration stays the same.

export ANTHROPIC_BASE_URL="https://api.evolved.to"
export ANTHROPIC_AUTH_TOKEN="$EVOLVED_API_KEY"
export ANTHROPIC_MODEL="claude-opus-5"

claude
# ~/.codex/config.toml
model = "gpt-5"
model_provider = "evolved"

[model_providers.evolved]
name = "evolved.to"
base_url = "https://api.evolved.to/v1"
env_key = "EVOLVED_API_KEY"
wire_api = "responses"
import os
import anthropic

client = anthropic.Anthropic(
    base_url="https://api.evolved.to",
    api_key=os.environ["EVOLVED_API_KEY"],
)

message = client.messages.create(
    model="claude-opus-5",
    max_tokens=16000,
    messages=[{"role": "user", "content": "Hello, Claude"}],
)

for block in message.content:
    if block.type == "text":
        print(block.text)
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.evolved.to/v1",
  apiKey: process.env.EVOLVED_API_KEY,
});

const response = await client.responses.create({
  model: "gpt-5",
  input: "Hello!",
});

console.log(response.output_text);

Security

Private by design, not by policy page

Your requests, your keys and your usage data are handled on a least-exposure principle, end to end over TLS 1.3.

Keys you control

Keys are hashed before they are stored and shown in full only once. Revoke or rotate one in a click, without touching the others.

Checked before routing

Every request is validated (key, balance and rate limits) before it reaches a model. Inactive keys are rejected at the edge.

Private by default

Request content is kept encrypted for at most 7 days for support, then deleted. Full keys and authorization headers are never logged.

FAQ

Questions, answered

Something else? Our docs cover every client and error code, and support answers from your dashboard.

evolved.to is an API gateway that gives you one key for 24 Claude and ChatGPT models. You point your tools at our base URL, and we route each request to OpenAI or Anthropic for you, with no separate provider accounts, keys or invoices.

Anything that speaks the Anthropic Messages API or the OpenAI API: Claude Code (terminal and IDE), Codex, Cursor, Cline, Roo Code, n8n, and the official Python and Node SDKs. Our docs have a step-by-step guide for each one.

Yes, on the Claude & ChatGPT plan. The same key works on our Anthropic-compatible and OpenAI-compatible endpoints, and to switch models you change the model name in your request or client settings. The Claude and ChatGPT plans cover one family each, for less.

Pick a plan and buy a credit pack. Claude and ChatGPT packs run from 50 of credit for 15 up to 2,000 for 125; Claude & ChatGPT packs, which cover both families, from 20 to 140. Every request is charged per token at the rates on our Models page and deducted from your credit. There are no subscriptions and no per-seat fees.

Your key's credit is checked before each request runs. When it is used up, requests are rejected with an insufficient_balance error instead of running up a bill. Buy another credit pack from your dashboard and we add the credit to your key.

Crypto, through a secure hosted checkout: USDC and USDT, Bitcoin, Ethereum and more than 100 other coins. Your API key is sent to your email once the payment confirms.

No. Our servers pass requests through without storing their content, and we never log API keys or authorization headers. Chats in your dashboard are saved only in your own browser.

No. evolved.to is an independent service. Claude is a trademark of Anthropic, and ChatGPT and GPT are trademarks of OpenAI.

Your next model is one line away.

Get a key, set a base URL, and ship with every Claude and ChatGPT model today.

Already have a key?

Open your dashboard to check your balance, token usage and request history, or add credit in seconds.

Open dashboard