gpt-5.5 vs gpt-5.6-terra
Side-by-side comparison of gpt-5.5 and gpt-5.6-terra: benchmarks, pricing, context window and capabilities. Both are accessible through Requesty's unified API. gpt-5.5 outperforms gpt-5.6-terra on 5 of 7 shared benchmarks.
gpt-5.5
Input / 1M
$5.00
Output / 1M
$30.00
Context
1.1M
Model ID
openai/gpt-5.5
gpt-5.6-terra
Input / 1M
$2.50
Output / 1M
$15.00
Context
1.1M
Model ID
openai/gpt-5.6-terra
Benchmark comparison
Intelligence Indexreasoning
gpt-5.554.8%
gpt-5.6-terra55.0%
Coding Indexcoding
gpt-5.574.9%
gpt-5.6-terra76.7%
GPQA Diamondreasoning
gpt-5.593.5%
gpt-5.6-terra92.5%
Terminal-Bench Hardagentic
gpt-5.560.6%
gpt-5.6-terra57.6%
τ²-Benchagentic
gpt-5.593.9%
gpt-5.6-terra86.3%
SciCodecoding
gpt-5.556.1%
gpt-5.6-terra53.9%
Humanity's Last Examreasoning
gpt-5.544.3%
gpt-5.6-terra41.8%
Scores sourced from official model cards, Artificial Analysis, and public leaderboards. Benchmarks measure specific skills and don't capture every aspect of model quality.
Pricing & specifications
| gpt-5.5 | gpt-5.6-terra | |
|---|---|---|
| Input price / 1M | $5.00 | $2.50 |
| Output price / 1M | $30.00 | $15.00 |
| Context window | 1.1M tokens | 1.1M tokens |
| Max output | 128K tokens | 128K tokens |
| Vision input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Prompt caching | Yes | Yes |
| Computer use | N/A | N/A |
| Provider | OpenAI Inc. | OpenAI Inc. |
Questions people ask
Is gpt-5.5 better than gpt-5.6-terra?
gpt-5.5 outperforms gpt-5.6-terra on 5 of 7 shared benchmarks. See the benchmark comparison above for specifics: gpt-5.5 and gpt-5.6-terra have different strengths across reasoning, coding, math and multimodal tasks.
Which is cheaper, gpt-5.5 or gpt-5.6-terra?
gpt-5.6-terra is cheaper. gpt-5.5 costs $5.00/$30.00 per 1M input/output tokens, while gpt-5.6-terra costs $2.50/$15.00.
Can I use gpt-5.5 and gpt-5.6-terra through the same API?
Yes. Requesty provides a single OpenAI-compatible API that routes to both. Change just the "model" parameter to switch between "openai/gpt-5.5" and "openai/gpt-5.6-terra", no other code changes needed.
What are the context windows?
gpt-5.5 supports up to 1.1M tokens of context. gpt-5.6-terra supports up to 1.1M tokens. Longer context means you can feed larger documents or codebases in a single prompt, though quality often degrades past 128K for most models.
Switch between gpt-5.5 and gpt-5.6-terra with one line of code
Requesty provides a single OpenAI-compatible API for 400+ models. Change the model parameter, not your code.