Claude Opus 5.5 vs Solar Pro 4: Specs & Benchmark Comparison
Claude Opus 5.5 is developed by Anthropic, while Solar Pro 4 comes from Upstage. Solar Pro 4 was released in August 2026, and Claude Opus 5.5 followed a month later in September 2026.
We have 31 benchmark results for Claude Opus 5.5 and 9 benchmark results for Solar Pro 4, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
Solar Pro 4 is the cheaper API at $0.30 per million input tokens and $1.20 per million output tokens, roughly 13 times cheaper than Claude Opus 5.5 at $4 and $20. Claude Opus 5.5 takes the larger context window at 1M tokens, compared with 524K for Solar Pro 4. Claude Opus 5.5 accepts text and images as input, while Solar Pro 4 accepts text. On tooling, only Claude Opus 5.5 supports function calling and only Claude Opus 5.5 offers structured output.
| Characteristic | Claude Opus 5.5 | Solar Pro 4 |
|---|---|---|
| Company | Anthropic | Upstage |
| Release Date | September 22, 2026 | August 6, 2026 |
| Parameters | — | — |
| Multimodal | Yes | No |
| Context (input) | 1.0M | 524K |
| Context (output) | 128K | 131K |
| Input Price / 1M | $4.00 | $0.30 |
| Output Price / 1M | $20.00 | $1.20 |
| Average Score | 71.1% | 69.9% |
Verdict
Claude Opus 5.5 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Claude Opus 5.5 — 0.7, Solar Pro 4 — 0.7.
Solar Pro 4 is 16.0x cheaper: input $0.30/1M vs $4.00/1M tokens.
Claude Opus 5.5 supports a larger context: 1M vs 524K tokens.
Claude Opus 5.5 is newer: released 9/22/2026 vs 8/6/2026.
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Frequently Asked Questions
Which is better for coding — Claude Opus 5.5 or Solar Pro 4?
Which model is cheaper — Claude Opus 5.5 or Solar Pro 4?
Which has a larger context window — Claude Opus 5.5 or Solar Pro 4?
The Claude Opus 5.5 and Solar Pro 4 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Opus 5.5 or Solar Pro 4 page. See also the complete list of AI model comparisons.