Claude Opus 4.8 vs GPT-5.6 Terra — Price, Context, and Capability Compared
Verdict
Claude Opus 4.8 costs 2.2× more per blended million tokens than GPT-5.6 Terra. Claude Opus 4.8 has the larger context window (500,000 tokens). Default to GPT-5.6 Terra unless you specifically need Claude Opus 4.8's edge.
Spec comparison
| Claude Opus 4.8 | GPT-5.6 Terra | |
|---|---|---|
| Price (input) | $5.00/M | $2.00/M ✓ |
| Price (output) | $25.00/M | $12.00/M ✓ |
| Blended price | $10.00/M | $4.50/M ✓ |
| Context window | 500,000 tokens ✓ | 400,000 tokens |
| Max output | 64,000 tokens | 128,000 tokens ✓ |
| Modalities | text, vision | text, vision |
| Reasoning mode | Yes | Yes |
| Released | 2026-04 | 2026-06 |
| Speed | 58 t/s | 78 t/s ✓ |
Cost at scale (3:1 blended)
| Tokens / month | Claude Opus 4.8 | GPT-5.6 Terra | Delta |
|---|---|---|---|
| 1,000,000 | $10.00 | $4.50 | $5.50 (2.2×) |
| 10,000,000 | $100.00 | $45.00 | $55.00 (2.2×) |
| 100,000,000 | $1000.00 | $450.00 | $550.00 (2.2×) |
Choose Claude Opus 4.8 if…
- ✓Elite coding and multi-step reasoning
- ✓Strong instruction following on ambiguous prompts
- ✓Extended-thinking mode
- ✓Complex, multi-step tasks where Fable 5’s premium isn’t justified.
Choose GPT-5.6 Terra if…
- ✓Balanced cost-to-intelligence ratio
- ✓Reasoning mode available on demand
- ✓Same 400K context as Sol
- ✓Everyday production workloads that need strong quality without Sol-tier pricing.
Run this exact matchup right now
Send the same prompt to Claude Opus 4.8 and GPT-5.6 Terra side by side and see the outputs yourself.
Try Claude Opus 4.8 vs GPT-5.6 Terra FreeFAQ
Is Claude Opus 4.8 cheaper than GPT-5.6 Terra?
GPT-5.6 Terra is cheaper, at $4.50 per million blended tokens vs $10.00 for Claude Opus 4.8.
Which has the bigger context window, Claude Opus 4.8 or GPT-5.6 Terra?
Claude Opus 4.8 has the larger context window: 500,000 tokens vs 400,000.
Can Claude Opus 4.8 replace GPT-5.6 Terra for coding?
Both are viable for coding. Elite coding and multi-step reasoning (Claude Opus 4.8) vs Balanced cost-to-intelligence ratio (GPT-5.6 Terra) — pick based on which strength matters more for your workload.
Which is faster, Claude Opus 4.8 or GPT-5.6 Terra?
GPT-5.6 Terra is faster: 78 t/s vs 58 t/s, measured on our speed benchmarks.
Related
Pricing verified 2026-06-07. Specs verified 2026-08-08.
