# Claude Fable 5 vs GPT-5.6 Sol Pro

Markdown version of https://kymaapi.com/compare/claude-fable-5-vs-gpt-5.6-sol-pro, for agents and crawlers. Same content as the HTML page.

- Generated: 2026-10-03T00:15:54.675Z
- HTML page: https://kymaapi.com/compare/claude-fable-5-vs-gpt-5.6-sol-pro
- Model catalog: https://kymaapi.com/models.md
- Pricing: https://kymaapi.com/pricing.md

2 models · 300 observations · under measurement since 1 Aug

Kyma serves all of these, so the availability, throughput and latency below are its own readings rather than anybody's marketing. What each creator publishes about its own model is further down, kept separate, and clearly theirs.

## Measured by Kyma

300 observations · since 1 Aug

- **Claude Fable 5** (`claude-fable-5`), Anthropic: 205 obs, since 13 Aug, 59 from Kyma's own probe
- **GPT-5.6 Sol Pro** (`gpt-5.6-sol-pro`), OpenAI: 95 obs, since 1 Aug, 57 from Kyma's own probe

## Availability, and how much of it we can actually see

Successful observations divided by total observations over the last 30 days, counting Kyma's own probe and real customer requests the same way. Same method and same figures as [/models](https://kymaapi.com/models).

**Claude Fable 5 is ahead** at 89.3%, by more than the thinnest sample here could produce by chance on 205 observations.

| Model | Availability |
| --- | --- |
| Claude Fable 5 | 89.3% |
| GPT-5.6 Sol Pro | 82.1% |

**The tinted band is the measurement's own grain.** It is 3.2 points wide, which is what three failed requests are worth in the thinnest sample on this page. One or two is what luck looks like, so a lead has to clear all three before this page will call it. Scale starts at 74%, not at zero, and dot size is the size of the sample behind the figure.

Anything inside the band is level with the leader as far as this measurement can tell. Anything left of it is genuinely behind.

## Throughput

Median tokens per second, from one identical prompt sent to every model every six hours, so the only variable left between two rows is the model.

| Model | Throughput |
| --- | --- |
| Claude Fable 5 | 15 tok/s |
| GPT-5.6 Sol Pro | 58 tok/s |

## Latency

Median time to a complete response on that same fixed prompt. It moves with output length, so it is a reading on one prompt rather than a promise about yours.

| Model | Latency |
| --- | --- |
| Claude Fable 5 | 3.06 s |
| GPT-5.6 Sol Pro | 3.35 s |

At least one model here has been measured for days rather than months. Its figures are real readings, not estimates, but they rest on a sample thin enough that a single failure would move them by a full point or more, which is why this page will not rank on them.

## Price on Kyma

What a request costs today, per 1M tokens. A model on offer shows the rate you are actually charged and the date it returns to list.

| Fact | Claude Fable 5 | GPT-5.6 Sol Pro |
| --- | --- | --- |
| Input (per 1M tokens) | $13.50 | $2.70 |
| Output (per 1M tokens) | $67.50 | $13.50 |
| Cached input (repeated prefixes) | not supported | $0.3375 |

## Published by the creator

The specification each creator publishes for its own model, read straight from the catalogue Kyma serves from. Nothing in this block is a Kyma opinion.

| Fact | Claude Fable 5 | GPT-5.6 Sol Pro |
| --- | --- | --- |
| Context window (tokens in one request) | 1M | 1.05M |
| Max output (ceiling on one response) | 128K | 128K |
| Accepts | Text, image, file | Text, image, file |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Vision input | Yes | Yes |
| Weights | Closed | Closed |
| Below release precision (narrower than the creator shipped) | Not established | Not established |

## What this instrument does not measure

This page carries no benchmark scores, so it will not tell you which model is smarter. It tells you which is cheaper, which is faster, which stays up, and what each one accepts. For the quality question, run both on your own prompts: one key, one line changed, and the answer is about your work rather than someone else's test set.

Every model above runs on one key and one balance. $0.50 of free-tier credit on signup, no card. [Get API key](https://kymaapi.com/signup)

## More comparisons

- [grok-4.6 vs claude-fable-5](https://kymaapi.com/compare/claude-fable-5-vs-grok-4.6)
- [grok-4.6 vs gpt-5.6-sol](https://kymaapi.com/compare/gpt-5.6-sol-vs-grok-4.6)
- [claude-opus-5 vs gpt-5.6-sol](https://kymaapi.com/compare/claude-opus-5-vs-gpt-5.6-sol)
- [grok-4.6 vs grok-4.5](https://kymaapi.com/compare/grok-4.5-vs-grok-4.6)
- [claude-sonnet-5 vs gemini-3.1-pro](https://kymaapi.com/compare/claude-sonnet-5-vs-gemini-3.1-pro)
- [gpt-5.6-terra vs claude-sonnet-5](https://kymaapi.com/compare/claude-sonnet-5-vs-gpt-5.6-terra)