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1 month ago
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openai/gpt-5 output has no code formatting in /ask mode
Issue
Bug: Code isn't formatted in output when using openai/gpt-5 or openrouter/openai/gpt-5 in /ask mode:
$ aider --no-git --model openai/gpt-5
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Aider v0.86.2.dev28+g11516d6d6
Main model: openai/gpt-5 with diff edit format
Weak model: openai/gpt-5-nano
Git repo: none
Repo-map: disabled
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> /ask write me a fib function in python
Here’s a simple, efficient iterative Fibonacci function (fib(0)=0, fib(1)=1):
def fib(n: int) -> int: if n < 0: raise ValueError("n must be >= 0") a, b = 0, 1 for _ in range(n): a, b = b, a + b return a
Tokens: 88 sent, 81 received. Cost: $0.00092 message, $0.00092 session.
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
$ aider --no-git --model openrouter/openai/gpt-5
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Aider v0.86.2.dev28+g11516d6d6
Main model: openrouter/openai/gpt-5 with diff edit format
Weak model: openrouter/openai/gpt-5-nano
Git repo: none
Repo-map: disabled
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> /ask write me a fib function in python
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
► THINKING
Creating Fibonacci Function
The user asked for a Fibonacci function in Python. They didn’t ask for extensive explanations, so I’ll keep it concise and focus on an iterative approach
since recursion can be inefficient and might cause stack overflow. My implementation will check for edge cases like fib(0) = 0 and fib(1) = 1, raising a
ValueError for negative inputs. I'll also ensure to validate that inputs are integers. Providing a straightforward iterative function is my priority,
keeping it simple and efficient.Outputting Fibonacci Code
I’ll provide a simple Fibonacci function in Python. First, I have the basic iterative implementation that validates input and raises errors for invalid
cases. It keeps it minimal without excessive formatting. The user also expressed interest in fast doubling, which is more complex, but I'll focus on that
later if needed. Since I'm not using fenced code, I’ll present it in plain text to ensure compatibility. This way, the user gets clean code without
formatting issues.Providing Fibonacci Function
I’m presenting a simple and efficient iterative Fibonacci function in Python. This function will take an integer input and return the corresponding
Fibonacci number. I believe it’s concise and straightforward, which is great for the user’s needs. I’ll make sure to keep the code clean and direct
without unnecessary embellishments. This way, the user can easily understand what the function does without any confusion. Let's go ahead and respond with
the code!
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
► ANSWER
Here’s a simple, efficient iterative Fibonacci function in Python:
def fib(n: int) -> int: if not isinstance(n, int): raise TypeError("n must be an integer") if n < 0: raise ValueError("n must be non-negative") a, b = 0,
1 for _ in range(n): a, b = b, a + b return a
Tokens: 88 sent, 436 received. Cost: $0.0045 message, $0.0045 session.
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>
But it's formatted correctly when using either of them in /code mode:
$ aider --no-git --model openai/gpt-5
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Aider v0.86.2.dev28+g11516d6d6
Main model: openai/gpt-5 with diff edit format
Weak model: openai/gpt-5-nano
Git repo: none
Repo-map: disabled
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> write me a fib function in python
fib.py
<<<<<<< SEARCH
=======
def fib(n: int) -> int:
"""Return the nth Fibonacci number with fib(0)=0 and fib(1)=1.
Args:
n: Index of the Fibonacci number to compute. Must be a non-negative integer.
Returns:
The nth Fibonacci number.
Raises:
TypeError: If n is not an integer.
ValueError: If n is negative.
"""
if not isinstance(n, int):
raise TypeError("n must be an int")
if n < 0:
raise ValueError("n must be >= 0")
a, b = 0, 1
for _ in range(n):
a, b = b, a + b
return a
>>>>>>> REPLACE
Tokens: 2.4k sent, 165 received. Cost: $0.0046 message, $0.0046 session.
fib.py
Create new file? (Y)es/(N)o [Yes]:
^C again to exit
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
>
$ aider --no-git --model openrouter/openai/gpt-5
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Aider v0.86.2.dev28+g11516d6d6
Main model: openrouter/openai/gpt-5 with diff edit format
Weak model: openrouter/openai/gpt-5-nano
Git repo: none
Repo-map: disabled
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> write me a fib function in python
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
► THINKING
Considering Fibonacci Function Implementation
I could implement a standard Fibonacci function that returns the nth number. I need to ensure that n is an integer and non-negative, raising errors if
not. While a generator could be an alternative, the user specifically requested "a fib function," so I should keep it straightforward. Caching with
functools.lru_cache is an option, but an iterative approach is simpler and efficient. I must also include a search/replace block for creating a new file
called fib.py.Clarifying Implementation Requirements
The developer instructions are clear: I need to focus on providing a Fib function. I should decide if edits are necessary but my priority is returning
code in a search/replace block. While I initially thought of suggesting edits or shell commands, the last instruction emphasizes only providing code. I’ll
create fib.py with a clear implementation, including appropriate docstrings and handling for F(0)=0 and F(1)=1. Including tests could be beneficial, but
since the user specified just the function, I’ll keep it minimal.Structuring the Fibonacci Code Block
I need to ensure that I format the code block correctly. The first line should indicate fib.py, followed by the code wrapped in a specific structure that
includes an empty SEARCH section. It's clear from earlier examples that I should leave that section empty with a newline after the first line.
Regarding the implementation, I’m considering whether to reject booleans when checking types. It seems simpler to throw a TypeError if input isn’t a
non-negative integer. I’ll proceed with the function definition that computes the nth Fibonacci number, keeping the docstring clear about F(0) and
F(1).Finalizing the Fibonacci Function Implementation
I have the function parameters and returns well-defined. It correctly raises a TypeError for non-integers and a ValueError for negative inputs. Python
nicely handles large integers, so I don't need to worry about that. Adding a sample usage with __name__ == '__main__' isn't required and would just add
extra text, which I need to avoid. I’ll focus on providing the search/replace block neatly without extra commentary. Let's deliver that final code block.
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
► ANSWER
fib.py
<<<<<<< SEARCH
=======
def fib(n: int) -> int:
"""
Return the nth Fibonacci number F(n) with F(0)=0 and F(1)=1.
Args:
n: Non-negative integer index.
Returns:
The nth Fibonacci number.
Raises:
TypeError: If n is not an int.
ValueError: If n is negative.
"""
if isinstance(n, bool) or not isinstance(n, int):
raise TypeError("n must be an int")
if n < 0:
raise ValueError("n must be >= 0")
a, b = 0, 1
for _ in range(n):
a, b = b, a + b
return a
>>>>>>> REPLACE
Tokens: 2.4k sent, 659 received. Cost: $0.0095 message, $0.0095 session.
fib.py
Create new file? (Y)es/(N)o [Yes]:
^C again to exit
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
>
And it's formatted correctly when using these other models in /ask mode:
-
openrouter/openai/gpt-5-codex -
gemini/gemini-2.5-pro -
anthropic/claude-sonnet-4-20250514
$ aider --no-git --model openrouter/openai/gpt-5-codex
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Aider v0.86.2.dev28+g11516d6d6
Model: openrouter/openai/gpt-5-codex with whole edit format
Git repo: none
Repo-map: disabled
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> /ask write me a fib function in python
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
► THINKING
Producing Fibonacci function
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
► ANSWER
Here’s a simple iterative Fibonacci function in Python:
def fib(n: int) -> int:
if n < 0:
raise ValueError("n must be non-negative")
a, b = 0, 1
for _ in range(n):
a, b = b, a + b
return a
It returns the n-th Fibonacci number with 0-based indexing.
Tokens: 88 sent, 143 received. Cost: $0.0015 message, $0.0015 session.
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
>
$ aider --no-git --model gemini/gemini-2.5-pro
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Aider v0.86.2.dev28+g11516d6d6
Main model: gemini/gemini-2.5-pro with diff-fenced edit format
Weak model: gemini/gemini-2.5-flash
Git repo: none
Repo-map: disabled
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> /ask write me a fib function in python
def fib(n):
if n <= 1:
return n
else:
return fib(n-1) + fib(n-2)
Tokens: 166 sent, 35 received. Cost: $0.00056 message, $0.00056 session.
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
$ aider --no-git --model anthropic/claude-sonnet-4-20250514
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Aider v0.86.2.dev28+g11516d6d6
Main model: anthropic/claude-sonnet-4-20250514 with diff edit format, infinite output
Weak model: anthropic/claude-3-5-haiku-20241022
Git repo: none
Repo-map: disabled
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
> /ask write me a fib function in python
Here's a simple Fibonacci function in Python:
def fib(n):
"""
Returns the nth Fibonacci number.
Args:
n (int): The position in the Fibonacci sequence (0-indexed)
Returns:
int: The nth Fibonacci number
"""
if n <= 1:
return n
a, b = 0, 1
for _ in range(2, n + 1):
a, b = b, a + b
return b
This implementation:
• Uses an iterative approach for efficiency (O(n) time, O(1) space)
• Handles the base cases where n is 0 or 1
• Uses tuple unpacking to elegantly swap values
• Returns the nth Fibonacci number where fib(0) = 0, fib(1) = 1, fib(2) = 1, etc.
Example usage:
print(fib(0)) # 0
print(fib(1)) # 1
print(fib(5)) # 5
print(fib(10)) # 55
Tokens: 88 sent, 241 received. Cost: $0.0039 message, $0.0039 session.
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Version and model info
(above)
