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GPT-6 Astra · Coding

GPT-6 Astra for coding: our test runs

GPT-6 Astra ran our 5 coding prompts in llmwise, through the same pipeline your messages take. Here's every reply as it came, whether it passed, what it cost and what it counts as on Pro, next to the other models.

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Based on 5 of our test runs on , through OpenRouter with the app's own prompt and settings. Updated .

Short answer

In our test runs on September 27, 2026, GPT-6 Astra passed 5 of 5 of our coding prompts (both hard ones): tied 1st of 15 models. Each reply counted as 1 message on Pro, where it has 31 a month, and cost $0.0223 to run on average.

Prompt by prompt

Each of the 5 coding prompts, and how GPT-6 Astra's reply did.

GPT-6 Astra on each coding prompt
PromptResultCostTime
Turn a title into a URL slugEverydayPassed: All 7 tests passed.$0.00842.1 s
Parse a duration like “1h 30m”EverydayPassed: All 10 tests passed.$0.02358.2 s
Merge overlapping intervalsEverydayPassed: All 7 tests passed.$0.01082.6 s
Evaluate an arithmetic expression, no evalHardPassed: All 15 tests passed.$0.037512.0 s
Parse CSV with quoted fieldsHardPassed: All 8 tests passed.$0.03149.1 s

Every coding reply from GPT-6 Astra

  1. Turn a title into a URL slug

    An everyday prompt: “Turn a title into a URL slug”, in full.

    Passed: All 7 tests passed.

    ```javascript
function slugify(title) {
  return title
    .toLowerCase()
    .normalize("NFD")
    .replace(/\p{M}/gu, "")
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
}
```

    483 tokens in, 71 out · 2.1 s · $0.0084 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·

  2. Parse a duration like “1h 30m”

    An everyday prompt: “Parse a duration like “1h 30m””, in full.

    Passed: All 10 tests passed.

    ```javascript
function parseDuration(text) {
  if (typeof text !== "string") return null;

  const match = /^\s*(?:(\d+)h\s*)?(?:(\d+)m\s*)?(?:(\d+)s\s*)?$/.exec(text);
  if (!match || (match[1] === undefined && match[2] === undefined && match[3] === undefined)) {
    return null;
  }

  return Number(match[1] ?? 0) * 3600
    + Number(match[2] ?? 0) * 60
    + Number(match[3] ?? 0);
}
```

    468 tokens in, 377 out (234 of them reasoning) · 8.2 s · $0.0235 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·

  3. Merge overlapping intervals

    An everyday prompt: “Merge overlapping intervals”, in full.

    Passed: All 7 tests passed.

    ```javascript
function mergeIntervals(intervals) {
  const sorted = intervals.map(([start, end]) => [start, end]);
  sorted.sort((a, b) => a[0] - b[0]);

  const merged = [];

  for (const [start, end] of sorted) {
    const last = merged[merged.length - 1];

    if (last && start <= last[1]) {
      last[1] = Math.max(last[1], end);
    } else {
      merged.push([start, end]);
    }
  }

  return merged;
}
```

    449 tokens in, 127 out · 2.6 s · $0.0108 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·

  4. Evaluate an arithmetic expression, no eval

    A hard prompt: “Evaluate an arithmetic expression, no eval”, in full.

    Passed: All 15 tests passed.

    ```javascript
function evaluate(expression) {
  if (typeof expression !== "string") {
    throw new Error("Expression must be a string");
  }

  let pos = 0;

  function skipSpaces() {
    while (pos < expression.length && /\s/.test(expression[pos])) {
      pos++;
    }
  }

  function consume(character) {
    skipSpaces();
    if (expression[pos] === character) {
      pos++;
      return true;
    }
    return false;
  }

  function fail(message) {
    throw new Error(`${message} at position ${pos}`);
  }

  function parsePrimary() {
    if (consume("(")) {
      const value = parseSum();
      if (!consume(")")) fail("Expected ')'");
      return value;
    }

    skipSpaces();
    const match = /^(?:\d+(?:\.\d*)?|\.\d+)/.exec(expression.slice(pos));
    if (!match) fail("Expected a number or '('");

    pos += match[0].length;
    return Number(match[0]);
  }

  function parsePower() {
    const base = parsePrimary();
    // Parsing the exponent as unary allows 2^-1 and makes ^ right-associative.
    return consume("^") ? base ** parseUnary() : base;
  }

  function parseUnary() {
    // Power binds more tightly than unary minus.
    return consume("-") ? -parseUnary() : parsePower();
  }

  function parseProduct() {
    let value = parseUnary();
    while (true) {
      if (consume("*")) value *= parseUnary();
      else if (consume("/")) value /= parseUnary();
      else return value;
    }
  }

  function parseSum() {
    let value = parseProduct();
    while (true) {
      if (consume("+")) value += parseProduct();
      else if (consume("-")) value -= parseProduct();
      else return value;
    }
  }

  const result = parseSum();
  skipSpaces();
  if (pos !== expression.length) fail("Unexpected input");
  return result;
}
```

    549 tokens in, 640 out (200 of them reasoning) · 12.0 s · $0.0375 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·

  5. Parse CSV with quoted fields

    A hard prompt: “Parse CSV with quoted fields”, in full.

    Passed: All 8 tests passed.

    ```javascript
function parseCsv(text) {
  if (text === "") return [];

  const rows = [];
  let row = [];
  let field = "";
  let inQuotes = false;
  let atFieldStart = true;

  for (let i = 0; i < text.length; i++) {
    const char = text[i];

    if (inQuotes) {
      if (char === '"') {
        if (text[i + 1] === '"') {
          field += '"';
          i++;
        } else {
          inQuotes = false;
        }
      } else {
        field += char;
      }
      continue;
    }

    if (char === '"' && atFieldStart) {
      inQuotes = true;
      atFieldStart = false;
    } else if (char === ",") {
      row.push(field);
      field = "";
      atFieldStart = true;
    } else if (
      char === "\n" ||
      (char === "\r" && text[i + 1] === "\n")
    ) {
      if (char === "\r") i++;
      row.push(field);
      rows.push(row);
      row = [];
      field = "";
      atFieldStart = true;
    } else {
      field += char;
      atFieldStart = false;
    }
  }

  if (row.length > 0 || !atFieldStart) {
    row.push(field);
    rows.push(row);
  }

  return rows;
}
```

    481 tokens in, 532 out (219 of them reasoning) · 9.1 s · $0.0314 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·

How it compares on coding

GPT-6 Astra beside the job's picks among every model. 13 models share the hard-problems pick, GPT-6 Astra among them.

GPT-6 Astra beside other models on coding
ModelPassedOn ProCost per reply
GLM 5.3Our pick: hard problems (shared), best value5 of 5250 a month on Pro$0.0015
GLM 5.3 FlashOur pick: hard problems (shared), everyday5 of 560 a day on Pro$0.0003
GPT-6 AstraOur pick: hard problems (shared)5 of 531 a month on Pro$0.0223
On Pro: Pro's count on each model. Cost: what OpenRouter charged us per reply, on average.

Every limit is published. Paid plans also have a monthly fair-use limit on AI cost: Pro $7.50, Max $20, Ultra $42, Studio $85. Using every message on your plan at typical sizes stays under it; very large messages and heavy research use it faster. Every limit, explained.

How these runs were done

Tests. Automatic. The function runs against the prompt's tests in a separate Node.js process with a time limit and no file, network or child-process access; it passes when every test passes.

How the runs were done, and every coding prompt.

GPT-6 Astra, and coding, elsewhere

Questions

Is GPT-6 Astra good for coding?

In our test runs it passed 5 of 5 coding prompts, tied 1st of the 15 models in llmwise. Every reply is on this page, so you can judge them yourself.

How many of my messages does a coding reply from GPT-6 Astra use?

1 message each on Pro, where it has 31 a month on Pro. The price of a message is fixed and shown before you send it, however long the reply.

How were these runs done?

The same way for every model: each prompt sent through llmwise's own pipeline, each reply checked the same way. The methods page has every prompt and how each is scored.

Claude, GPT, Gemini, DeepSeek, Grok, Kimi, and GLM, in one chat.

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