Add new turbo 0613 models

[fmguerreiro]

Based on the new model update that got announced recently:

Not sure how welcome this is, might get a bit tricky to keep up to date.

[karthink]

Thanks, this looks good.

Could you also update the documentation for the user option gptel-model with the new choices?

[fmguerreiro]

Could you also update the documentation for the user option gptel-model with the new choices?

done in f43562e

[PalaceChan]

in about a week (june 27th) the 3.5 and 4 model series will be promoted and become the same as the 0613 snapshot, obviating this change. Is it worth adding these dangling "symlink" model snapshots (especially late in their life cycle)? On the other hand the more interesting permanent model variants are the 16k 3.5 and the 32k 4.0 models so might it be better to add those instead and link to the openai models page in the docs?

[karthink]

@PalaceChan Didn't know that, thanks for pointing it out. I think it's better to add only the new permanent variants in this case. @fmguerreiro Could you make the change?

[fmguerreiro]

@fmguerreiro Could you make the change?

Done!

• Kept gpt-3.5-turbo and gpt-3.5-turbo-16k https://platform.openai.com/docs/models/gpt-3-5
• Kept gpt-4 and gpt-4-32k https://platform.openai.com/docs/models/gpt-4

[karthink]

Cheers @fmguerreiro, @PalaceChan