Claude Fable 5 vs GPT-5.6 Terra: Specs & Benchmark Comparison
| Characteristic | Claude Fable 5 | GPT-5.6 Terra |
|---|---|---|
| Company | Anthropic | OpenAI |
| Release Date | June 9, 2026 | July 9, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 128K | 128K |
| Input Price / 1M | $10.00 | $2.00 |
| Output Price / 1M | $50.00 | $12.00 |
| Average Score | 0.6 | 0.6 |
| Benchmarks | ||
| ExploitBench | 0.8 | 0.5 |
| SWE-Bench Pro | 0.8 | 0.6 |
| FrontierCode 1.1 | 0.5 | 0.4 |
| HealthBench Professional | 0.7 | 0.6 |
| GDP.pdf | 0.3 | 0.2 |
| Terminal-Bench 2.1 | 0.8 | 0.9 |
| AutomationBench | 0.2 | 0.2 |
| DeepSWE 1.1 | 0.7 | 0.7 |
Visual Benchmark Comparison
Claude Fable 5
GPT-5.6 Terra
ExploitBench0.8 vs 0.5
0.8
0.5
SWE-Bench Pro0.8 vs 0.6
0.8
0.6
FrontierCode 1.10.5 vs 0.4
0.5
0.4
HealthBench Professional0.7 vs 0.6
0.7
0.6
GDP.pdf0.3 vs 0.2
0.3
0.2
Terminal-Bench 2.10.8 vs 0.9
0.8
0.9
AutomationBench0.2 vs 0.2
0.2
0.2
DeepSWE 1.10.7 vs 0.7
0.7
0.7
Verdict
GPT-5.6 Terra leads in 3 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Claude Fable 5 — 0.6, GPT-5.6 Terra — 0.6.
API Cost
GPT-5.6 Terra is 4.3x cheaper: input $2.00/1M vs $10.00/1M tokens.
Context Window
GPT-5.6 Terra supports a larger context: 1M vs 1M tokens.
Recency
GPT-5.6 Terra is newer: released 7/9/2026 vs 6/9/2026.
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Frequently Asked Questions
Which is better for coding — Claude Fable 5 or GPT-5.6 Terra?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude Fable 5 or GPT-5.6 Terra?
GPT-5.6 Terra is cheaper for input: $2.00 per 1M tokens vs $10.00.
Which has a larger context window — Claude Fable 5 or GPT-5.6 Terra?
GPT-5.6 Terra supports a larger context: 1,050,000 tokens vs 1,000,000.
The Claude Fable 5 and GPT-5.6 Terra comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Fable 5 or GPT-5.6 Terra page. See also the complete list of AI model comparisons.