text model comparison
Claude Opus 4.8 vs GPT-5.6 Sol
Claude Opus 4.8 and GPT-5.6 Sol are both current text models, from Anthropic and OpenAI. GPT-5.6 Sol is 20% cheaper per 1M input tokens than Claude Opus 4.8, $4 vs $5. On Arena Text, Claude Opus 4.8 scores 1481 Elo and GPT-5.6 Sol 1485 Elo (Arena, measured October 8, 2026). GPT-5.6 Sol has the larger context window, 1,050,000 vs 1,000,000 tokens.
Data verified October 12, 2026 · Dataset 2026-10-12
Side by side
Standard-tier prices in effect today. The better value in each row is highlighted.
| Fact | Claude Opus 4.8 | GPT-5.6 Sol |
|---|---|---|
| Price per 1M input tokens | $5 | $4 (better) |
| Price per 1M output tokens | $25 | $20 (better) |
| Cost of 10M input and 2M output tokens | $100 | $80 (better) |
| Arena Text | 1481 Elo (#15 of 39) | 1485 Elo (#10 of 39) (better) |
| GPQA Diamond | 91% (#20 of 37) | 93.5% (#11 of 37) (better) |
| FrontierMath Tiers 1-3 (v2) | 80% (#13 of 37) | 89.1% (#6 of 37) (better) |
| SimpleQA Verified | 53% (#17 of 34) | 69.7% (#7 of 34) (better) |
| LiveBench Overall | 78.93 points (#2 of 5) | Not measured |
| Provider | Anthropic | OpenAI |
| Release date | May 28, 2026 | July 9, 2026 |
| Access | API only | API only |
| Context window | 1,000,000 tokens | 1,050,000 tokens |
| Max output | Not reported | 128,000 tokens |
| Input | text | text, image |
| Output | text | text |
Scores:Arena · 2026-10-12Epoch AI · 2026-10-12LiveBench · 2026-06-25
When to choose each
Claude Opus 4.8
Best for
- Long-running agentic and professional-work evaluations
Watch out for
- Maximum output length is not represented because the approved source set does not establish one unambiguously
GPT-5.6 Sol
Best for
- Frontier capability evaluations for complex API workflows
- Long-horizon coding and research agents that use computer use or MCP tools
Watch out for
- Not in the pinned LiveBench snapshot; its independent scores here come from Epoch AI's own GPQA Diamond, FrontierMath and SimpleQA Verified runs
Claude Opus 4.8 vs GPT-5.6 Sol FAQ
Which is cheaper, Claude Opus 4.8 or GPT-5.6 Sol?
GPT-5.6 Sol is 20% cheaper per 1M input tokens than Claude Opus 4.8, $4 vs $5. For 10M input and 2M output tokens, Claude Opus 4.8 costs $100 and GPT-5.6 Sol $80 at standard rates.
Which scores higher on independent benchmarks, Claude Opus 4.8 or GPT-5.6 Sol?
GPT-5.6 Sol leads on Arena Text, 1485 Elo to 1481 Elo; GPT-5.6 Sol leads on GPQA Diamond, 93.5% to 91%; GPT-5.6 Sol leads on FrontierMath Tiers 1-3 (v2), 89.1% to 80%. Scores are independent evaluations, not either vendor's launch figures.
Which has the larger context window, Claude Opus 4.8 or GPT-5.6 Sol?
GPT-5.6 Sol has the larger context window, 1,050,000 vs 1,000,000 tokens.
Related comparisons
Production evaluation
Choosing between Claude Opus 4.8 and GPT-5.6 Sol?
Public benchmarks narrow the shortlist. We run both on your own tasks, data and cost limits, then build the routing and review controls to run the winner in production.
- A head-to-head evaluation on your real workload
- Routing between models by cost and difficulty